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_bootstrap_external.py
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"""Core implementation of path-based import. This module is NOT meant to be directly imported! It has been designed such that it can be bootstrapped into Python as the implementation of import. As such it requires the injection of specific modules and attributes in order to work. One should use importlib as the public-facing version of this module. """ # IMPORTANT: Whenever making changes to this module, be sure to run a top-level # `make regen-importlib` followed by `make` in order to get the frozen version # of the module updated. Not doing so will result in the Makefile to fail for # all others who don't have a ./python around to freeze the module in the early # stages of compilation. # # See importlib._setup() for what is injected into the global namespace. # When editing this code be aware that code executed at import time CANNOT # reference any injected objects! This includes not only global code but also # anything specified at the class level. # Module injected manually by _set_bootstrap_module() _bootstrap = None # Import builtin modules import _imp import _io import sys import _warnings import marshal _MS_WINDOWS = (sys.platform == 'win32') if _MS_WINDOWS: import nt as _os import winreg else: import posix as _os if _MS_WINDOWS: path_separators = ['\\', '/'] else: path_separators = ['/'] # Assumption made in _path_join() assert all(len(sep) == 1 for sep in path_separators) path_sep = path_separators[0] path_sep_tuple = tuple(path_separators) path_separators = ''.join(path_separators) _pathseps_with_colon = {f':{s}' for s in path_separators} # Bootstrap-related code ###################################################### _CASE_INSENSITIVE_PLATFORMS_STR_KEY = 'win', _CASE_INSENSITIVE_PLATFORMS_BYTES_KEY = 'cygwin', 'darwin' _CASE_INSENSITIVE_PLATFORMS = (_CASE_INSENSITIVE_PLATFORMS_BYTES_KEY + _CASE_INSENSITIVE_PLATFORMS_STR_KEY) def _make_relax_case(): if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS): if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS_STR_KEY): key = 'PYTHONCASEOK' else: key = b'PYTHONCASEOK' def _relax_case(): """True if filenames must be checked case-insensitively and ignore environment flags are not set.""" return not sys.flags.ignore_environment and key in _os.environ else: def _relax_case(): """True if filenames must be checked case-insensitively.""" return False return _relax_case _relax_case = _make_relax_case() def _pack_uint32(x): """Convert a 32-bit integer to little-endian.""" return (int(x) & 0xFFFFFFFF).to_bytes(4, 'little') def _unpack_uint32(data): """Convert 4 bytes in little-endian to an integer.""" assert len(data) == 4 return int.from_bytes(data, 'little') def _unpack_uint16(data): """Convert 2 bytes in little-endian to an integer.""" assert len(data) == 2 return int.from_bytes(data, 'little') if _MS_WINDOWS: def _path_join(*path_parts): """Replacement for os.path.join().""" if not path_parts: return "" if len(path_parts) == 1: return path_parts[0] root = "" path = [] for new_root, tail in map(_os._path_splitroot, path_parts): if new_root.startswith(path_sep_tuple) or new_root.endswith(path_sep_tuple): root = new_root.rstrip(path_separators) or root path = [path_sep + tail] elif new_root.endswith(':'): if root.casefold() != new_root.casefold(): # Drive relative paths have to be resolved by the OS, so we reset the # tail but do not add a path_sep prefix. root = new_root path = [tail] else: path.append(tail) else: root = new_root or root path.append(tail) path = [p.rstrip(path_separators) for p in path if p] if len(path) == 1 and not path[0]: # Avoid losing the root's trailing separator when joining with nothing return root + path_sep return root + path_sep.join(path) else: def _path_join(*path_parts): """Replacement for os.path.join().""" return path_sep.join([part.rstrip(path_separators) for part in path_parts if part]) def _path_split(path): """Replacement for os.path.split().""" i = max(path.rfind(p) for p in path_separators) if i < 0: return '', path return path[:i], path[i + 1:] def _path_stat(path): """Stat the path. Made a separate function to make it easier to override in experiments (e.g. cache stat results). """ return _os.stat(path) def _path_is_mode_type(path, mode): """Test whether the path is the specified mode type.""" try: stat_info = _path_stat(path) except OSError: return False return (stat_info.st_mode & 0o170000) == mode def _path_isfile(path): """Replacement for os.path.isfile.""" return _path_is_mode_type(path, 0o100000) def _path_isdir(path): """Replacement for os.path.isdir.""" if not path: path = _os.getcwd() return _path_is_mode_type(path, 0o040000) if _MS_WINDOWS: def _path_isabs(path): """Replacement for os.path.isabs.""" if not path: return False root = _os._path_splitroot(path)[0].replace('/', '\\') return len(root) > 1 and (root.startswith('\\\\') or root.endswith('\\')) else: def _path_isabs(path): """Replacement for os.path.isabs.""" return path.startswith(path_separators) def _write_atomic(path, data, mode=0o666): """Best-effort function to write data to a path atomically. Be prepared to handle a FileExistsError if concurrent writing of the temporary file is attempted.""" # id() is used to generate a pseudo-random filename. path_tmp = '{}.{}'.format(path, id(path)) fd = _os.open(path_tmp, _os.O_EXCL | _os.O_CREAT | _os.O_WRONLY, mode & 0o666) try: # We first write data to a temporary file, and then use os.replace() to # perform an atomic rename. with _io.FileIO(fd, 'wb') as file: file.write(data) _os.replace(path_tmp, path) except OSError: try: _os.unlink(path_tmp) except OSError: pass raise _code_type = type(_write_atomic.__code__) # Finder/loader utility code ############################################### # Magic word to reject .pyc files generated by other Python versions. # It should change for each incompatible change to the bytecode. # # The value of CR and LF is incorporated so if you ever read or write # a .pyc file in text mode the magic number will be wrong; also, the # Apple MPW compiler swaps their values, botching string constants. # # There were a variety of old schemes for setting the magic number. # The current working scheme is to increment the previous value by # 10. # # Starting with the adoption of PEP 3147 in Python 3.2, every bump in magic # number also includes a new "magic tag", i.e. a human readable string used # to represent the magic number in __pycache__ directories. When you change # the magic number, you must also set a new unique magic tag. Generally this # can be named after the Python major version of the magic number bump, but # it can really be anything, as long as it's different than anything else # that's come before. The tags are included in the following table, starting # with Python 3.2a0. # # Known values: # Python 1.5: 20121 # Python 1.5.1: 20121 # Python 1.5.2: 20121 # Python 1.6: 50428 # Python 2.0: 50823 # Python 2.0.1: 50823 # Python 2.1: 60202 # Python 2.1.1: 60202 # Python 2.1.2: 60202 # Python 2.2: 60717 # Python 2.3a0: 62011 # Python 2.3a0: 62021 # Python 2.3a0: 62011 (!) # Python 2.4a0: 62041 # Python 2.4a3: 62051 # Python 2.4b1: 62061 # Python 2.5a0: 62071 # Python 2.5a0: 62081 (ast-branch) # Python 2.5a0: 62091 (with) # Python 2.5a0: 62092 (changed WITH_CLEANUP opcode) # Python 2.5b3: 62101 (fix wrong code: for x, in ...) # Python 2.5b3: 62111 (fix wrong code: x += yield) # Python 2.5c1: 62121 (fix wrong lnotab with for loops and # storing constants that should have been removed) # Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp) # Python 2.6a0: 62151 (peephole optimizations and STORE_MAP opcode) # Python 2.6a1: 62161 (WITH_CLEANUP optimization) # Python 2.7a0: 62171 (optimize list comprehensions/change LIST_APPEND) # Python 2.7a0: 62181 (optimize conditional branches: # introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE) # Python 2.7a0 62191 (introduce SETUP_WITH) # Python 2.7a0 62201 (introduce BUILD_SET) # Python 2.7a0 62211 (introduce MAP_ADD and SET_ADD) # Python 3000: 3000 # 3010 (removed UNARY_CONVERT) # 3020 (added BUILD_SET) # 3030 (added keyword-only parameters) # 3040 (added signature annotations) # 3050 (print becomes a function) # 3060 (PEP 3115 metaclass syntax) # 3061 (string literals become unicode) # 3071 (PEP 3109 raise changes) # 3081 (PEP 3137 make __file__ and __name__ unicode) # 3091 (kill str8 interning) # 3101 (merge from 2.6a0, see 62151) # 3103 (__file__ points to source file) # Python 3.0a4: 3111 (WITH_CLEANUP optimization). # Python 3.0b1: 3131 (lexical exception stacking, including POP_EXCEPT #3021) # Python 3.1a1: 3141 (optimize list, set and dict comprehensions: # change LIST_APPEND and SET_ADD, add MAP_ADD #2183) # Python 3.1a1: 3151 (optimize conditional branches: # introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE #4715) # Python 3.2a1: 3160 (add SETUP_WITH #6101) # tag: cpython-32 # Python 3.2a2: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR #9225) # tag: cpython-32 # Python 3.2a3 3180 (add DELETE_DEREF #4617) # Python 3.3a1 3190 (__class__ super closure changed) # Python 3.3a1 3200 (PEP 3155 __qualname__ added #13448) # Python 3.3a1 3210 (added size modulo 2**32 to the pyc header #13645) # Python 3.3a2 3220 (changed PEP 380 implementation #14230) # Python 3.3a4 3230 (revert changes to implicit __class__ closure #14857) # Python 3.4a1 3250 (evaluate positional default arguments before # keyword-only defaults #16967) # Python 3.4a1 3260 (add LOAD_CLASSDEREF; allow locals of class to override # free vars #17853) # Python 3.4a1 3270 (various tweaks to the __class__ closure #12370) # Python 3.4a1 3280 (remove implicit class argument) # Python 3.4a4 3290 (changes to __qualname__ computation #19301) # Python 3.4a4 3300 (more changes to __qualname__ computation #19301) # Python 3.4rc2 3310 (alter __qualname__ computation #20625) # Python 3.5a1 3320 (PEP 465: Matrix multiplication operator #21176) # Python 3.5b1 3330 (PEP 448: Additional Unpacking Generalizations #2292) # Python 3.5b2 3340 (fix dictionary display evaluation order #11205) # Python 3.5b3 3350 (add GET_YIELD_FROM_ITER opcode #24400) # Python 3.5.2 3351 (fix BUILD_MAP_UNPACK_WITH_CALL opcode #27286) # Python 3.6a0 3360 (add FORMAT_VALUE opcode #25483) # Python 3.6a1 3361 (lineno delta of code.co_lnotab becomes signed #26107) # Python 3.6a2 3370 (16 bit wordcode #26647) # Python 3.6a2 3371 (add BUILD_CONST_KEY_MAP opcode #27140) # Python 3.6a2 3372 (MAKE_FUNCTION simplification, remove MAKE_CLOSURE # #27095) # Python 3.6b1 3373 (add BUILD_STRING opcode #27078) # Python 3.6b1 3375 (add SETUP_ANNOTATIONS and STORE_ANNOTATION opcodes # #27985) # Python 3.6b1 3376 (simplify CALL_FUNCTIONs & BUILD_MAP_UNPACK_WITH_CALL #27213) # Python 3.6b1 3377 (set __class__ cell from type.__new__ #23722) # Python 3.6b2 3378 (add BUILD_TUPLE_UNPACK_WITH_CALL #28257) # Python 3.6rc1 3379 (more thorough __class__ validation #23722) # Python 3.7a1 3390 (add LOAD_METHOD and CALL_METHOD opcodes #26110) # Python 3.7a2 3391 (update GET_AITER #31709) # Python 3.7a4 3392 (PEP 552: Deterministic pycs #31650) # Python 3.7b1 3393 (remove STORE_ANNOTATION opcode #32550) # Python 3.7b5 3394 (restored docstring as the first stmt in the body; # this might affected the first line number #32911) # Python 3.8a1 3400 (move frame block handling to compiler #17611) # Python 3.8a1 3401 (add END_ASYNC_FOR #33041) # Python 3.8a1 3410 (PEP570 Python Positional-Only Parameters #36540) # Python 3.8b2 3411 (Reverse evaluation order of key: value in dict # comprehensions #35224) # Python 3.8b2 3412 (Swap the position of positional args and positional # only args in ast.arguments #37593) # Python 3.8b4 3413 (Fix "break" and "continue" in "finally" #37830) # Python 3.9a0 3420 (add LOAD_ASSERTION_ERROR #34880) # Python 3.9a0 3421 (simplified bytecode for with blocks #32949) # Python 3.9a0 3422 (remove BEGIN_FINALLY, END_FINALLY, CALL_FINALLY, POP_FINALLY bytecodes #33387) # Python 3.9a2 3423 (add IS_OP, CONTAINS_OP and JUMP_IF_NOT_EXC_MATCH bytecodes #39156) # Python 3.9a2 3424 (simplify bytecodes for *value unpacking) # Python 3.9a2 3425 (simplify bytecodes for **value unpacking) # Python 3.10a1 3430 (Make 'annotations' future by default) # Python 3.10a1 3431 (New line number table format -- PEP 626) # Python 3.10a2 3432 (Function annotation for MAKE_FUNCTION is changed from dict to tuple bpo-42202) # Python 3.10a2 3433 (RERAISE restores f_lasti if oparg != 0) # Python 3.10a6 3434 (PEP 634: Structural Pattern Matching) # Python 3.10a7 3435 Use instruction offsets (as opposed to byte offsets). # Python 3.10b1 3436 (Add GEN_START bytecode #43683) # Python 3.10b1 3437 (Undo making 'annotations' future by default - We like to dance among core devs!) # Python 3.10b1 3438 Safer line number table handling. # Python 3.10b1 3439 (Add ROT_N) # # MAGIC must change whenever the bytecode emitted by the compiler may no # longer be understood by older implementations of the eval loop (usually # due to the addition of new opcodes). # # Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array # in PC/launcher.c must also be updated. MAGIC_NUMBER = (3439).to_bytes(2, 'little') + b'\r\n' _RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c _PYCACHE = '__pycache__' _OPT = 'opt-' SOURCE_SUFFIXES = ['.py'] if _MS_WINDOWS: SOURCE_SUFFIXES.append('.pyw') EXTENSION_SUFFIXES = _imp.extension_suffixes() BYTECODE_SUFFIXES = ['.pyc'] # Deprecated. DEBUG_BYTECODE_SUFFIXES = OPTIMIZED_BYTECODE_SUFFIXES = BYTECODE_SUFFIXES def cache_from_source(path, debug_override=None, *, optimization=None): """Given the path to a .py file, return the path to its .pyc file. The .py file does not need to exist; this simply returns the path to the .pyc file calculated as if the .py file were imported. The 'optimization' parameter controls the presumed optimization level of the bytecode file. If 'optimization' is not None, the string representation of the argument is taken and verified to be alphanumeric (else ValueError is raised). The debug_override parameter is deprecated. If debug_override is not None, a True value is the same as setting 'optimization' to the empty string while a False value is equivalent to setting 'optimization' to '1'. If sys.implementation.cache_tag is None then NotImplementedError is raised. """ if debug_override is not None: _warnings.warn('the debug_override parameter is deprecated; use ' "'optimization' instead", DeprecationWarning) if optimization is not None: message = 'debug_override or optimization must be set to None' raise TypeError(message) optimization = '' if debug_override else 1 path = _os.fspath(path) head, tail = _path_split(path) base, sep, rest = tail.rpartition('.') tag = sys.implementation.cache_tag if tag is None: raise NotImplementedError('sys.implementation.cache_tag is None') almost_filename = ''.join([(base if base else rest), sep, tag]) if optimization is None: if sys.flags.optimize == 0: optimization = '' else: optimization = sys.flags.optimize optimization = str(optimization) if optimization != '': if not optimization.isalnum(): raise ValueError('{!r} is not alphanumeric'.format(optimization)) almost_filename = '{}.{}{}'.format(almost_filename, _OPT, optimization) filename = almost_filename + BYTECODE_SUFFIXES[0] if sys.pycache_prefix is not None: # We need an absolute path to the py file to avoid the possibility of # collisions within sys.pycache_prefix, if someone has two different # `foo/bar.py` on their system and they import both of them using the # same sys.pycache_prefix. Let's say sys.pycache_prefix is # `C:\Bytecode`; the idea here is that if we get `Foo\Bar`, we first # make it absolute (`C:\Somewhere\Foo\Bar`), then make it root-relative # (`Somewhere\Foo\Bar`), so we end up placing the bytecode file in an # unambiguous `C:\Bytecode\Somewhere\Foo\Bar\`. if not _path_isabs(head): head = _path_join(_os.getcwd(), head) # Strip initial drive from a Windows path. We know we have an absolute # path here, so the second part of the check rules out a POSIX path that # happens to contain a colon at the second character. if head[1] == ':' and head[0] not in path_separators: head = head[2:] # Strip initial path separator from `head` to complete the conversion # back to a root-relative path before joining. return _path_join( sys.pycache_prefix, head.lstrip(path_separators), filename, ) return _path_join(head, _PYCACHE, filename) def source_from_cache(path): """Given the path to a .pyc. file, return the path to its .py file. The .pyc file does not need to exist; this simply returns the path to the .py file calculated to correspond to the .pyc file. If path does not conform to PEP 3147/488 format, ValueError will be raised. If sys.implementation.cache_tag is None then NotImplementedError is raised. """ if sys.implementation.cache_tag is None: raise NotImplementedError('sys.implementation.cache_tag is None') path = _os.fspath(path) head, pycache_filename = _path_split(path) found_in_pycache_prefix = False if sys.pycache_prefix is not None: stripped_path = sys.pycache_prefix.rstrip(path_separators) if head.startswith(stripped_path + path_sep): head = head[len(stripped_path):] found_in_pycache_prefix = True if not found_in_pycache_prefix: head, pycache = _path_split(head) if pycache != _PYCACHE: raise ValueError(f'{_PYCACHE} not bottom-level directory in ' f'{path!r}') dot_count = pycache_filename.count('.') if dot_count not in {2, 3}: raise ValueError(f'expected only 2 or 3 dots in {pycache_filename!r}') elif dot_count == 3: optimization = pycache_filename.rsplit('.', 2)[-2] if not optimization.startswith(_OPT): raise ValueError("optimization portion of filename does not start " f"with {_OPT!r}") opt_level = optimization[len(_OPT):] if not opt_level.isalnum(): raise ValueError(f"optimization level {optimization!r} is not an " "alphanumeric value") base_filename = pycache_filename.partition('.')[0] return _path_join(head, base_filename + SOURCE_SUFFIXES[0]) def _get_sourcefile(bytecode_path): """Convert a bytecode file path to a source path (if possible). This function exists purely for backwards-compatibility for PyImport_ExecCodeModuleWithFilenames() in the C API. """ if len(bytecode_path) == 0: return None rest, _, extension = bytecode_path.rpartition('.') if not rest or extension.lower()[-3:-1] != 'py': return bytecode_path try: source_path = source_from_cache(bytecode_path) except (NotImplementedError, ValueError): source_path = bytecode_path[:-1] return source_path if _path_isfile(source_path) else bytecode_path def _get_cached(filename): if filename.endswith(tuple(SOURCE_SUFFIXES)): try: return cache_from_source(filename) except NotImplementedError: pass elif filename.endswith(tuple(BYTECODE_SUFFIXES)): return filename else: return None def _calc_mode(path): """Calculate the mode permissions for a bytecode file.""" try: mode = _path_stat(path).st_mode except OSError: mode = 0o666 # We always ensure write access so we can update cached files # later even when the source files are read-only on Windows (#6074) mode |= 0o200 return mode def _check_name(method): """Decorator to verify that the module being requested matches the one the loader can handle. The first argument (self) must define _name which the second argument is compared against. If the comparison fails then ImportError is raised. """ def _check_name_wrapper(self, name=None, *args, **kwargs): if name is None: name = self.name elif self.name != name: raise ImportError('loader for %s cannot handle %s' % (self.name, name), name=name) return method(self, name, *args, **kwargs) # FIXME: @_check_name is used to define class methods before the # _bootstrap module is set by _set_bootstrap_module(). if _bootstrap is not None: _wrap = _bootstrap._wrap else: def _wrap(new, old): for replace in ['__module__', '__name__', '__qualname__', '__doc__']: if hasattr(old, replace): setattr(new, replace, getattr(old, replace)) new.__dict__.update(old.__dict__) _wrap(_check_name_wrapper, method) return _check_name_wrapper def _find_module_shim(self, fullname): """Try to find a loader for the specified module by delegating to self.find_loader(). This method is deprecated in favor of finder.find_spec(). """ _warnings.warn("find_module() is deprecated and " "slated for removal in Python 3.12; use find_spec() instead", DeprecationWarning) # Call find_loader(). If it returns a string (indicating this # is a namespace package portion), generate a warning and # return None. loader, portions = self.find_loader(fullname) if loader is None and len(portions): msg = 'Not importing directory {}: missing __init__' _warnings.warn(msg.format(portions[0]), ImportWarning) return loader def _classify_pyc(data, name, exc_details): """Perform basic validity checking of a pyc header and return the flags field, which determines how the pyc should be further validated against the source. *data* is the contents of the pyc file. (Only the first 16 bytes are required, though.) *name* is the name of the module being imported. It is used for logging. *exc_details* is a dictionary passed to ImportError if it raised for improved debugging. ImportError is raised when the magic number is incorrect or when the flags field is invalid. EOFError is raised when the data is found to be truncated. """ magic = data[:4] if magic != MAGIC_NUMBER: message = f'bad magic number in {name!r}: {magic!r}' _bootstrap._verbose_message('{}', message) raise ImportError(message, **exc_details) if len(data) < 16: message = f'reached EOF while reading pyc header of {name!r}' _bootstrap._verbose_message('{}', message) raise EOFError(message) flags = _unpack_uint32(data[4:8]) # Only the first two flags are defined. if flags & ~0b11: message = f'invalid flags {flags!r} in {name!r}' raise ImportError(message, **exc_details) return flags def _validate_timestamp_pyc(data, source_mtime, source_size, name, exc_details): """Validate a pyc against the source last-modified time. *data* is the contents of the pyc file. (Only the first 16 bytes are required.) *source_mtime* is the last modified timestamp of the source file. *source_size* is None or the size of the source file in bytes. *name* is the name of the module being imported. It is used for logging. *exc_details* is a dictionary passed to ImportError if it raised for improved debugging. An ImportError is raised if the bytecode is stale. """ if _unpack_uint32(data[8:12]) != (source_mtime & 0xFFFFFFFF): message = f'bytecode is stale for {name!r}' _bootstrap._verbose_message('{}', message) raise ImportError(message, **exc_details) if (source_size is not None and _unpack_uint32(data[12:16]) != (source_size & 0xFFFFFFFF)): raise ImportError(f'bytecode is stale for {name!r}', **exc_details) def _validate_hash_pyc(data, source_hash, name, exc_details): """Validate a hash-based pyc by checking the real source hash against the one in the pyc header. *data* is the contents of the pyc file. (Only the first 16 bytes are required.) *source_hash* is the importlib.util.source_hash() of the source file. *name* is the name of the module being imported. It is used for logging. *exc_details* is a dictionary passed to ImportError if it raised for improved debugging. An ImportError is raised if the bytecode is stale. """ if data[8:16] != source_hash: raise ImportError( f'hash in bytecode doesn\'t match hash of source {name!r}', **exc_details, ) def _compile_bytecode(data, name=None, bytecode_path=None, source_path=None): """Compile bytecode as found in a pyc.""" code = marshal.loads(data) if isinstance(code, _code_type): _bootstrap._verbose_message('code object from {!r}', bytecode_path) if source_path is not None: _imp._fix_co_filename(code, source_path) return code else: raise ImportError('Non-code object in {!r}'.format(bytecode_path), name=name, path=bytecode_path) def _code_to_timestamp_pyc(code, mtime=0, source_size=0): "Produce the data for a timestamp-based pyc." data = bytearray(MAGIC_NUMBER) data.extend(_pack_uint32(0)) data.extend(_pack_uint32(mtime)) data.extend(_pack_uint32(source_size)) data.extend(marshal.dumps(code)) return data def _code_to_hash_pyc(code, source_hash, checked=True): "Produce the data for a hash-based pyc." data = bytearray(MAGIC_NUMBER) flags = 0b1 | checked << 1 data.extend(_pack_uint32(flags)) assert len(source_hash) == 8 data.extend(source_hash) data.extend(marshal.dumps(code)) return data def decode_source(source_bytes): """Decode bytes representing source code and return the string. Universal newline support is used in the decoding. """ import tokenize # To avoid bootstrap issues. source_bytes_readline = _io.BytesIO(source_bytes).readline encoding = tokenize.detect_encoding(source_bytes_readline) newline_decoder = _io.IncrementalNewlineDecoder(None, True) return newline_decoder.decode(source_bytes.decode(encoding[0])) # Module specifications ####################################################### _POPULATE = object() def spec_from_file_location(name, location=None, *, loader=None, submodule_search_locations=_POPULATE): """Return a module spec based on a file location. To indicate that the module is a package, set submodule_search_locations to a list of directory paths. An empty list is sufficient, though its not otherwise useful to the import system. The loader must take a spec as its only __init__() arg. """ if location is None: # The caller may simply want a partially populated location- # oriented spec. So we set the location to a bogus value and # fill in as much as we can. location = '<unknown>' if hasattr(loader, 'get_filename'): # ExecutionLoader try: location = loader.get_filename(name) except ImportError: pass else: location = _os.fspath(location) if not _path_isabs(location): try: location = _path_join(_os.getcwd(), location) except OSError: pass # If the location is on the filesystem, but doesn't actually exist, # we could return None here, indicating that the location is not # valid. However, we don't have a good way of testing since an # indirect location (e.g. a zip file or URL) will look like a # non-existent file relative to the filesystem. spec = _bootstrap.ModuleSpec(name, loader, origin=location) spec._set_fileattr = True # Pick a loader if one wasn't provided. if loader is None: for loader_class, suffixes in _get_supported_file_loaders(): if location.endswith(tuple(suffixes)): loader = loader_class(name, location) spec.loader = loader break else: return None # Set submodule_search_paths appropriately. if submodule_search_locations is _POPULATE: # Check the loader. if hasattr(loader, 'is_package'): try: is_package = loader.is_package(name) except ImportError: pass else: if is_package: spec.submodule_search_locations = [] else: spec.submodule_search_locations = submodule_search_locations if spec.submodule_search_locations == []: if location: dirname = _path_split(location)[0] spec.submodule_search_locations.append(dirname) return spec # Loaders ##################################################################### class WindowsRegistryFinder: """Meta path finder for modules declared in the Windows registry.""" REGISTRY_KEY = ( 'Software\\Python\\PythonCore\\{sys_version}' '\\Modules\\{fullname}') REGISTRY_KEY_DEBUG = ( 'Software\\Python\\PythonCore\\{sys_version}' '\\Modules\\{fullname}\\Debug') DEBUG_BUILD = (_MS_WINDOWS and '_d.pyd' in EXTENSION_SUFFIXES) @staticmethod def _open_registry(key): try: return winreg.OpenKey(winreg.HKEY_CURRENT_USER, key) except OSError: return winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, key) @classmethod def _search_registry(cls, fullname): if cls.DEBUG_BUILD: registry_key = cls.REGISTRY_KEY_DEBUG else: registry_key = cls.REGISTRY_KEY key = registry_key.format(fullname=fullname, sys_version='%d.%d' % sys.version_info[:2]) try: with cls._open_registry(key) as hkey: filepath = winreg.QueryValue(hkey, '') except OSError: return None return filepath @classmethod def find_spec(cls, fullname, path=None, target=None): filepath = cls._search_registry(fullname) if filepath is None: return None try: _path_stat(filepath) except OSError: return None for loader, suffixes in _get_supported_file_loaders(): if filepath.endswith(tuple(suffixes)): spec = _bootstrap.spec_from_loader(fullname, loader(fullname, filepath), origin=filepath) return spec @classmethod def find_module(cls, fullname, path=None): """Find module named in the registry. This method is deprecated. Use find_spec() instead. """ _warnings.warn("WindowsRegistryFinder.find_module() is deprecated and " "slated for removal in Python 3.12; use find_spec() instead", DeprecationWarning) spec = cls.find_spec(fullname, path) if spec is not None: return spec.loader else: return None class _LoaderBasics: """Base class of common code needed by both SourceLoader and SourcelessFileLoader.""" def is_package(self, fullname): """Concrete implementation of InspectLoader.is_package by checking if the path returned by get_filename has a filename of '__init__.py'.""" filename = _path_split(self.get_filename(fullname))[1] filename_base = filename.rsplit('.', 1)[0] tail_name = fullname.rpartition('.')[2] return filename_base == '__init__' and tail_name != '__init__' def create_module(self, spec): """Use default semantics for module creation.""" def exec_module(self, module): """Execute the module.""" code = self.get_code(module.__name__) if code is None: raise ImportError('cannot load module {!r} when get_code() ' 'returns None'.format(module.__name__)) _bootstrap._call_with_frames_removed(exec, code, module.__dict__) def load_module(self, fullname): """This method is deprecated.""" # Warning implemented in _load_module_shim(). return _bootstrap._load_module_shim(self, fullname) class SourceLoader(_LoaderBasics): def path_mtime(self, path): """Optional method that returns the modification time (an int) for the specified path (a str). Raises OSError when the path cannot be handled. """ raise OSError def path_stats(self, path): """Optional method returning a metadata dict for the specified path (a str). Possible keys: - 'mtime' (mandatory) is the numeric timestamp of last source code modification; - 'size' (optional) is the size in bytes of the source code. Implementing this method allows the loader to read bytecode files. Raises OSError when the path cannot be handled. """ return {'mtime': self.path_mtime(path)} def _cache_bytecode(self, source_path, cache_path, data): """Optional method which writes data (bytes) to a file path (a str). Implementing this method allows for the writing of bytecode files. The source path is needed in order to correctly transfer permissions """ # For backwards compatibility, we delegate to set_data() return self.set_data(cache_path, data) def set_data(self, path, data): """Optional method which writes data (bytes) to a file path (a str). Implementing this method allows for the writing of bytecode files. """ def get_source(self, fullname): """Concrete implementation of InspectLoader.get_source.""" path = self.get_filename(fullname) try: source_bytes = self.get_data(path) except OSError as exc: raise ImportError('source not available through get_data()', name=fullname) from exc return decode_source(source_bytes) def source_to_code(self, data, path, *, _optimize=-1): """Return the code object compiled from source. The 'data' argument can be any object type that compile() supports. """ return _bootstrap._call_with_frames_removed(compile, data, path, 'exec', dont_inherit=True, optimize=_optimize) def get_code(self, fullname): """Concrete implementation of InspectLoader.get_code. Reading of bytecode requires path_stats to be implemented. To write bytecode, set_data must also be implemented. """ source_path = self.get_filename(fullname) source_mtime = None source_bytes = None source_hash = None hash_based = False check_source = True try: bytecode_path = cache_from_source(source_path) except NotImplementedError: bytecode_path = None else: try: st = self.path_stats(source_path) except OSError: pass else: source_mtime = int(st['mtime']) try: data = self.get_data(bytecode_path) except OSError: pass else: exc_details = { 'name': fullname, 'path': bytecode_path, } try: flags = _classify_pyc(data, fullname, exc_details) bytes_data = memoryview(data)[16:] hash_based = flags & 0b1 != 0 if hash_based: check_source = flags & 0b10 != 0 if (_imp.check_hash_based_pycs != 'never' and (check_source or _imp.check_hash_based_pycs == 'always')): source_bytes = self.get_data(source_path) source_hash = _imp.source_hash( _RAW_MAGIC_NUMBER, source_bytes, ) _validate_hash_pyc(data, source_hash, fullname, exc_details) else: _validate_timestamp_pyc( data, source_mtime, st['size'], fullname, exc_details, ) except (ImportError, EOFError): pass else: _bootstrap._verbose_message('{} matches {}', bytecode_path, source_path) return _compile_bytecode(bytes_data, name=fullname, bytecode_path=bytecode_path, source_path=source_path) if source_bytes is None: source_bytes = self.get_data(source_path) code_object = self.source_to_code(source_bytes, source_path) _bootstrap._verbose_message('code object from {}', source_path) if (not sys.dont_write_bytecode and bytecode_path is not None and source_mtime is not None): if hash_based: if source_hash is None: source_hash = _imp.source_hash(source_bytes) data = _code_to_hash_pyc(code_object, source_hash, check_source) else: data = _code_to_timestamp_pyc(code_object, source_mtime, len(source_bytes)) try: self._cache_bytecode(source_path, bytecode_path, data) except NotImplementedError: pass return code_object class FileLoader: """Base file loader class which implements the loader protocol methods that require file system usage.""" def __init__(self, fullname, path): """Cache the module name and the path to the file found by the finder.""" self.name = fullname self.path = path def __eq__(self, other): return (self.__class__ == other.__class__ and self.__dict__ == other.__dict__) def __hash__(self): return hash(self.name) ^ hash(self.path) @_check_name def load_module(self, fullname): """Load a module from a file. This method is deprecated. Use exec_module() instead. """ # The only reason for this method is for the name check. # Issue #14857: Avoid the zero-argument form of super so the implementation # of that form can be updated without breaking the frozen module. return super(FileLoader, self).load_module(fullname) @_check_name def get_filename(self, fullname): """Return the path to the source file as found by the finder.""" return self.path def get_data(self, path): """Return the data from path as raw bytes.""" if isinstance(self, (SourceLoader, ExtensionFileLoader)): with _io.open_code(str(path)) as file: return file.read() else: with _io.FileIO(path, 'r') as file: return file.read() @_check_name def get_resource_reader(self, module): from importlib.readers import FileReader return FileReader(self) class SourceFileLoader(FileLoader, SourceLoader): """Concrete implementation of SourceLoader using the file system.""" def path_stats(self, path): """Return the metadata for the path.""" st = _path_stat(path) return {'mtime': st.st_mtime, 'size': st.st_size} def _cache_bytecode(self, source_path, bytecode_path, data): # Adapt between the two APIs mode = _calc_mode(source_path) return self.set_data(bytecode_path, data, _mode=mode) def set_data(self, path, data, *, _mode=0o666): """Write bytes data to a file.""" parent, filename = _path_split(path) path_parts = [] # Figure out what directories are missing. while parent and not _path_isdir(parent): parent, part = _path_split(parent) path_parts.append(part) # Create needed directories. for part in reversed(path_parts): parent = _path_join(parent, part) try: _os.mkdir(parent) except FileExistsError: # Probably another Python process already created the dir. continue except OSError as exc: # Could be a permission error, read-only filesystem: just forget # about writing the data. _bootstrap._verbose_message('could not create {!r}: {!r}', parent, exc) return try: _write_atomic(path, data, _mode) _bootstrap._verbose_message('created {!r}', path) except OSError as exc: # Same as above: just don't write the bytecode. _bootstrap._verbose_message('could not create {!r}: {!r}', path, exc) class SourcelessFileLoader(FileLoader, _LoaderBasics): """Loader which handles sourceless file imports.""" def get_code(self, fullname): path = self.get_filename(fullname) data = self.get_data(path) # Call _classify_pyc to do basic validation of the pyc but ignore the # result. There's no source to check against. exc_details = { 'name': fullname, 'path': path, } _classify_pyc(data, fullname, exc_details) return _compile_bytecode( memoryview(data)[16:], name=fullname, bytecode_path=path, ) def get_source(self, fullname): """Return None as there is no source code.""" return None class ExtensionFileLoader(FileLoader, _LoaderBasics): """Loader for extension modules. The constructor is designed to work with FileFinder. """ def __init__(self, name, path): self.name = name self.path = path def __eq__(self, other): return (self.__class__ == other.__class__ and self.__dict__ == other.__dict__) def __hash__(self): return hash(self.name) ^ hash(self.path) def create_module(self, spec): """Create an unitialized extension module""" module = _bootstrap._call_with_frames_removed( _imp.create_dynamic, spec) _bootstrap._verbose_message('extension module {!r} loaded from {!r}', spec.name, self.path) return module def exec_module(self, module): """Initialize an extension module""" _bootstrap._call_with_frames_removed(_imp.exec_dynamic, module) _bootstrap._verbose_message('extension module {!r} executed from {!r}', self.name, self.path) def is_package(self, fullname): """Return True if the extension module is a package.""" file_name = _path_split(self.path)[1] return any(file_name == '__init__' + suffix for suffix in EXTENSION_SUFFIXES) def get_code(self, fullname): """Return None as an extension module cannot create a code object.""" return None def get_source(self, fullname): """Return None as extension modules have no source code.""" return None @_check_name def get_filename(self, fullname): """Return the path to the source file as found by the finder.""" return self.path class _NamespacePath: """Represents a namespace package's path. It uses the module name to find its parent module, and from there it looks up the parent's __path__. When this changes, the module's own path is recomputed, using path_finder. For top-level modules, the parent module's path is sys.path.""" # When invalidate_caches() is called, this epoch is incremented # https://bugs.python.org/issue45703 _epoch = 0 def __init__(self, name, path, path_finder): self._name = name self._path = path self._last_parent_path = tuple(self._get_parent_path()) self._last_epoch = self._epoch self._path_finder = path_finder def _find_parent_path_names(self): """Returns a tuple of (parent-module-name, parent-path-attr-name)""" parent, dot, me = self._name.rpartition('.') if dot == '': # This is a top-level module. sys.path contains the parent path. return 'sys', 'path' # Not a top-level module. parent-module.__path__ contains the # parent path. return parent, '__path__' def _get_parent_path(self): parent_module_name, path_attr_name = self._find_parent_path_names() return getattr(sys.modules[parent_module_name], path_attr_name) def _recalculate(self): # If the parent's path has changed, recalculate _path parent_path = tuple(self._get_parent_path()) # Make a copy if parent_path != self._last_parent_path or self._epoch != self._last_epoch: spec = self._path_finder(self._name, parent_path) # Note that no changes are made if a loader is returned, but we # do remember the new parent path if spec is not None and spec.loader is None: if spec.submodule_search_locations: self._path = spec.submodule_search_locations self._last_parent_path = parent_path # Save the copy self._last_epoch = self._epoch return self._path def __iter__(self): return iter(self._recalculate()) def __getitem__(self, index): return self._recalculate()[index] def __setitem__(self, index, path): self._path[index] = path def __len__(self): return len(self._recalculate()) def __repr__(self): return '_NamespacePath({!r})'.format(self._path) def __contains__(self, item): return item in self._recalculate() def append(self, item): self._path.append(item) # We use this exclusively in module_from_spec() for backward-compatibility. class _NamespaceLoader: def __init__(self, name, path, path_finder): self._path = _NamespacePath(name, path, path_finder) @staticmethod def module_repr(module): """Return repr for the module. The method is deprecated. The import machinery does the job itself. """ _warnings.warn("_NamespaceLoader.module_repr() is deprecated and " "slated for removal in Python 3.12", DeprecationWarning) return '<module {!r} (namespace)>'.format(module.__name__) def is_package(self, fullname): return True def get_source(self, fullname): return '' def get_code(self, fullname): return compile('', '<string>', 'exec', dont_inherit=True) def create_module(self, spec): """Use default semantics for module creation.""" def exec_module(self, module): pass def load_module(self, fullname): """Load a namespace module. This method is deprecated. Use exec_module() instead. """ # The import system never calls this method. _bootstrap._verbose_message('namespace module loaded with path {!r}', self._path) # Warning implemented in _load_module_shim(). return _bootstrap._load_module_shim(self, fullname) def get_resource_reader(self, module): from importlib.readers import NamespaceReader return NamespaceReader(self._path) # Finders ##################################################################### class PathFinder: """Meta path finder for sys.path and package __path__ attributes.""" @staticmethod def invalidate_caches(): """Call the invalidate_caches() method on all path entry finders stored in sys.path_importer_caches (where implemented).""" for name, finder in list(sys.path_importer_cache.items()): if finder is None: del sys.path_importer_cache[name] elif hasattr(finder, 'invalidate_caches'): finder.invalidate_caches() # Also invalidate the caches of _NamespacePaths # https://bugs.python.org/issue45703 _NamespacePath._epoch += 1 @staticmethod def _path_hooks(path): """Search sys.path_hooks for a finder for 'path'.""" if sys.path_hooks is not None and not sys.path_hooks: _warnings.warn('sys.path_hooks is empty', ImportWarning) for hook in sys.path_hooks: try: return hook(path) except ImportError: continue else: return None @classmethod def _path_importer_cache(cls, path): """Get the finder for the path entry from sys.path_importer_cache. If the path entry is not in the cache, find the appropriate finder and cache it. If no finder is available, store None. """ if path == '': try: path = _os.getcwd() except FileNotFoundError: # Don't cache the failure as the cwd can easily change to # a valid directory later on. return None try: finder = sys.path_importer_cache[path] except KeyError: finder = cls._path_hooks(path) sys.path_importer_cache[path] = finder return finder @classmethod def _legacy_get_spec(cls, fullname, finder): # This would be a good place for a DeprecationWarning if # we ended up going that route. if hasattr(finder, 'find_loader'): msg = (f"{_bootstrap._object_name(finder)}.find_spec() not found; " "falling back to find_loader()") _warnings.warn(msg, ImportWarning) loader, portions = finder.find_loader(fullname) else: msg = (f"{_bootstrap._object_name(finder)}.find_spec() not found; " "falling back to find_module()") _warnings.warn(msg, ImportWarning) loader = finder.find_module(fullname) portions = [] if loader is not None: return _bootstrap.spec_from_loader(fullname, loader) spec = _bootstrap.ModuleSpec(fullname, None) spec.submodule_search_locations = portions return spec @classmethod def _get_spec(cls, fullname, path, target=None): """Find the loader or namespace_path for this module/package name.""" # If this ends up being a namespace package, namespace_path is # the list of paths that will become its __path__ namespace_path = [] for entry in path: if not isinstance(entry, (str, bytes)): continue finder = cls._path_importer_cache(entry) if finder is not None: if hasattr(finder, 'find_spec'): spec = finder.find_spec(fullname, target) else: spec = cls._legacy_get_spec(fullname, finder) if spec is None: continue if spec.loader is not None: return spec portions = spec.submodule_search_locations if portions is None: raise ImportError('spec missing loader') # This is possibly part of a namespace package. # Remember these path entries (if any) for when we # create a namespace package, and continue iterating # on path. namespace_path.extend(portions) else: spec = _bootstrap.ModuleSpec(fullname, None) spec.submodule_search_locations = namespace_path return spec @classmethod def find_spec(cls, fullname, path=None, target=None): """Try to find a spec for 'fullname' on sys.path or 'path'. The search is based on sys.path_hooks and sys.path_importer_cache. """ if path is None: path = sys.path spec = cls._get_spec(fullname, path, target) if spec is None: return None elif spec.loader is None: namespace_path = spec.submodule_search_locations if namespace_path: # We found at least one namespace path. Return a spec which # can create the namespace package. spec.origin = None spec.submodule_search_locations = _NamespacePath(fullname, namespace_path, cls._get_spec) return spec else: return None else: return spec @classmethod def find_module(cls, fullname, path=None): """find the module on sys.path or 'path' based on sys.path_hooks and sys.path_importer_cache. This method is deprecated. Use find_spec() instead. """ _warnings.warn("PathFinder.find_module() is deprecated and " "slated for removal in Python 3.12; use find_spec() instead", DeprecationWarning) spec = cls.find_spec(fullname, path) if spec is None: return None return spec.loader @staticmethod def find_distributions(*args, **kwargs): """ Find distributions. Return an iterable of all Distribution instances capable of loading the metadata for packages matching ``context.name`` (or all names if ``None`` indicated) along the paths in the list of directories ``context.path``. """ from importlib.metadata import MetadataPathFinder return MetadataPathFinder.find_distributions(*args, **kwargs) class FileFinder: """File-based finder. Interactions with the file system are cached for performance, being refreshed when the directory the finder is handling has been modified. """ def __init__(self, path, *loader_details): """Initialize with the path to search on and a variable number of 2-tuples containing the loader and the file suffixes the loader recognizes.""" loaders = [] for loader, suffixes in loader_details: loaders.extend((suffix, loader) for suffix in suffixes) self._loaders = loaders # Base (directory) path self.path = path or '.' if not _path_isabs(self.path): self.path = _path_join(_os.getcwd(), self.path) self._path_mtime = -1 self._path_cache = set() self._relaxed_path_cache = set() def invalidate_caches(self): """Invalidate the directory mtime.""" self._path_mtime = -1 find_module = _find_module_shim def find_loader(self, fullname): """Try to find a loader for the specified module, or the namespace package portions. Returns (loader, list-of-portions). This method is deprecated. Use find_spec() instead. """ _warnings.warn("FileFinder.find_loader() is deprecated and " "slated for removal in Python 3.12; use find_spec() instead", DeprecationWarning) spec = self.find_spec(fullname) if spec is None: return None, [] return spec.loader, spec.submodule_search_locations or [] def _get_spec(self, loader_class, fullname, path, smsl, target): loader = loader_class(fullname, path) return spec_from_file_location(fullname, path, loader=loader, submodule_search_locations=smsl) def find_spec(self, fullname, target=None): """Try to find a spec for the specified module. Returns the matching spec, or None if not found. """ is_namespace = False tail_module = fullname.rpartition('.')[2] try: mtime = _path_stat(self.path or _os.getcwd()).st_mtime except OSError: mtime = -1 if mtime != self._path_mtime: self._fill_cache() self._path_mtime = mtime # tail_module keeps the original casing, for __file__ and friends if _relax_case(): cache = self._relaxed_path_cache cache_module = tail_module.lower() else: cache = self._path_cache cache_module = tail_module # Check if the module is the name of a directory (and thus a package). if cache_module in cache: base_path = _path_join(self.path, tail_module) for suffix, loader_class in self._loaders: init_filename = '__init__' + suffix full_path = _path_join(base_path, init_filename) if _path_isfile(full_path): return self._get_spec(loader_class, fullname, full_path, [base_path], target) else: # If a namespace package, return the path if we don't # find a module in the next section. is_namespace = _path_isdir(base_path) # Check for a file w/ a proper suffix exists. for suffix, loader_class in self._loaders: try: full_path = _path_join(self.path, tail_module + suffix) except ValueError: return None _bootstrap._verbose_message('trying {}', full_path, verbosity=2) if cache_module + suffix in cache: if _path_isfile(full_path): return self._get_spec(loader_class, fullname, full_path, None, target) if is_namespace: _bootstrap._verbose_message('possible namespace for {}', base_path) spec = _bootstrap.ModuleSpec(fullname, None) spec.submodule_search_locations = [base_path] return spec return None def _fill_cache(self): """Fill the cache of potential modules and packages for this directory.""" path = self.path try: contents = _os.listdir(path or _os.getcwd()) except (FileNotFoundError, PermissionError, NotADirectoryError): # Directory has either been removed, turned into a file, or made # unreadable. contents = [] # We store two cached versions, to handle runtime changes of the # PYTHONCASEOK environment variable. if not sys.platform.startswith('win'): self._path_cache = set(contents) else: # Windows users can import modules with case-insensitive file # suffixes (for legacy reasons). Make the suffix lowercase here # so it's done once instead of for every import. This is safe as # the specified suffixes to check against are always specified in a # case-sensitive manner. lower_suffix_contents = set() for item in contents: name, dot, suffix = item.partition('.') if dot: new_name = '{}.{}'.format(name, suffix.lower()) else: new_name = name lower_suffix_contents.add(new_name) self._path_cache = lower_suffix_contents if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS): self._relaxed_path_cache = {fn.lower() for fn in contents} @classmethod def path_hook(cls, *loader_details): """A class method which returns a closure to use on sys.path_hook which will return an instance using the specified loaders and the path called on the closure. If the path called on the closure is not a directory, ImportError is raised. """ def path_hook_for_FileFinder(path): """Path hook for importlib.machinery.FileFinder.""" if not _path_isdir(path): raise ImportError('only directories are supported', path=path) return cls(path, *loader_details) return path_hook_for_FileFinder def __repr__(self): return 'FileFinder({!r})'.format(self.path) # Import setup ############################################################### def _fix_up_module(ns, name, pathname, cpathname=None): # This function is used by PyImport_ExecCodeModuleObject(). loader = ns.get('__loader__') spec = ns.get('__spec__') if not loader: if spec: loader = spec.loader elif pathname == cpathname: loader = SourcelessFileLoader(name, pathname) else: loader = SourceFileLoader(name, pathname) if not spec: spec = spec_from_file_location(name, pathname, loader=loader) try: ns['__spec__'] = spec ns['__loader__'] = loader ns['__file__'] = pathname ns['__cached__'] = cpathname except Exception: # Not important enough to report. pass def _get_supported_file_loaders(): """Returns a list of file-based module loaders. Each item is a tuple (loader, suffixes). """ extensions = ExtensionFileLoader, _imp.extension_suffixes() source = SourceFileLoader, SOURCE_SUFFIXES bytecode = SourcelessFileLoader, BYTECODE_SUFFIXES return [extensions, source, bytecode] def _set_bootstrap_module(_bootstrap_module): global _bootstrap _bootstrap = _bootstrap_module def _install(_bootstrap_module): """Install the path-based import components.""" _set_bootstrap_module(_bootstrap_module) supported_loaders = _get_supported_file_loaders() sys.path_hooks.extend([FileFinder.path_hook(*supported_loaders)]) sys.meta_path.append(PathFinder)