diff options
Diffstat (limited to 'Lib/importlib/_bootstrap.py')
| -rw-r--r-- | Lib/importlib/_bootstrap.py | 454 |
1 files changed, 234 insertions, 220 deletions
diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py index 08d5eb4..155403e 100644 --- a/Lib/importlib/_bootstrap.py +++ b/Lib/importlib/_bootstrap.py @@ -48,13 +48,7 @@ def _w_long(x): XXX Temporary until marshal's long functions are exposed. """ - x = int(x) - int_bytes = [] - int_bytes.append(x & 0xFF) - int_bytes.append((x >> 8) & 0xFF) - int_bytes.append((x >> 16) & 0xFF) - int_bytes.append((x >> 24) & 0xFF) - return bytearray(int_bytes) + return (int(x) & 0xFFFFFFFF).to_bytes(4, 'little') # TODO: Expose from marshal @@ -64,35 +58,25 @@ def _r_long(int_bytes): XXX Temporary until marshal's long function are exposed. """ - x = int_bytes[0] - x |= int_bytes[1] << 8 - x |= int_bytes[2] << 16 - x |= int_bytes[3] << 24 - return x + return int.from_bytes(int_bytes, 'little') def _path_join(*path_parts): """Replacement for os.path.join().""" - new_parts = [] - for part in path_parts: - if not part: - continue - new_parts.append(part) - if part[-1] not in path_separators: - new_parts.append(path_sep) - return ''.join(new_parts[:-1]) # Drop superfluous path separator. + return path_sep.join([part.rstrip(path_separators) + for part in path_parts if part]) def _path_split(path): """Replacement for os.path.split().""" + if len(path_separators) == 1: + front, _, tail = path.rpartition(path_sep) + return front, tail for x in reversed(path): if x in path_separators: - sep = x - break - else: - sep = path_sep - front, _, tail = path.rpartition(sep) - return front, tail + front, tail = path.rsplit(x, maxsplit=1) + return front, tail + return '', path def _path_is_mode_type(path, mode): @@ -237,7 +221,7 @@ class _ModuleLock: self.wakeup.release() def __repr__(self): - return "_ModuleLock(%r) at %d" % (self.name, id(self)) + return "_ModuleLock({!r}) at {}".format(self.name, id(self)) class _DummyModuleLock: @@ -258,7 +242,7 @@ class _DummyModuleLock: self.count -= 1 def __repr__(self): - return "_DummyModuleLock(%r) at %d" % (self.name, id(self)) + return "_DummyModuleLock({!r}) at {}".format(self.name, id(self)) # The following two functions are for consumption by Python/import.c. @@ -315,95 +299,104 @@ def _call_with_frames_removed(f, *args, **kwds): # 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. - -The magic numbers must be spaced apart at least 2 values, as the --U interpeter flag will cause MAGIC+1 being used. They have been -odd numbers for some time now. - -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 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 3.0a5: 3131 (lexical exception stacking, including POP_EXCEPT) - Python 3.1a0: 3141 (optimize list, set and dict comprehensions: - change LIST_APPEND and SET_ADD, add MAP_ADD) - Python 3.1a0: 3151 (optimize conditional branches: - introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE) - Python 3.2a0: 3160 (add SETUP_WITH) - tag: cpython-32 - Python 3.2a1: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR) - tag: cpython-32 - Python 3.2a2 3180 (add DELETE_DEREF) - Python 3.3a0 3190 __class__ super closure changed - Python 3.3a0 3200 (__qualname__ added) - 3210 (added size modulo 2**32 to the pyc header) - Python 3.3a1 3220 (changed PEP 380 implementation) - Python 3.3a4 3230 (revert changes to implicit __class__ closure) - -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). +# 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. +# +# The magic numbers must be spaced apart at least 2 values, as the +# -U interpeter flag will cause MAGIC+1 being used. They have been +# odd numbers for some time now. +# +# 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 3.0a5: 3131 (lexical exception stacking, including POP_EXCEPT) +# Python 3.1a0: 3141 (optimize list, set and dict comprehensions: +# change LIST_APPEND and SET_ADD, add MAP_ADD) +# Python 3.1a0: 3151 (optimize conditional branches: +# introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE) +# Python 3.2a0: 3160 (add SETUP_WITH) +# tag: cpython-32 +# Python 3.2a1: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR) +# tag: cpython-32 +# Python 3.2a2 3180 (add DELETE_DEREF) +# Python 3.3a0 3190 __class__ super closure changed +# Python 3.3a0 3200 (__qualname__ added) +# 3210 (added size modulo 2**32 to the pyc header) +# Python 3.3a1 3220 (changed PEP 380 implementation) +# Python 3.3a4 3230 (revert changes to implicit __class__ closure) +# Python 3.4a1 3250 (evaluate positional default arguments before +# keyword-only defaults) +# Python 3.4a1 3260 (add LOAD_CLASSDEREF; allow locals of class to override +# free vars) +# +# 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). -""" -_RAW_MAGIC_NUMBER = 3230 | ord('\r') << 16 | ord('\n') << 24 -_MAGIC_BYTES = bytes(_RAW_MAGIC_NUMBER >> n & 0xff for n in range(0, 25, 8)) +_MAGIC_BYTES = (3260).to_bytes(2, 'little') + b'\r\n' +_RAW_MAGIC_NUMBER = int.from_bytes(_MAGIC_BYTES, 'little') _PYCACHE = '__pycache__' @@ -483,6 +476,18 @@ def _get_sourcefile(bytecode_path): return source_path if _path_isfile(source_stats) else bytecode_path +def _calc_mode(path): + """Calculate the mode permissions for a bytecode file.""" + try: + mode = _os.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 _verbose_message(message, *args, verbosity=1): """Print the message to stderr if -v/PYTHONVERBOSE is turned on.""" if sys.flags.verbose >= verbosity: @@ -508,7 +513,7 @@ def set_loader(fxn): """Set __loader__ on the returned module.""" def set_loader_wrapper(self, *args, **kwargs): module = fxn(self, *args, **kwargs) - if not hasattr(module, '__loader__'): + if getattr(module, '__loader__', None) is None: module.__loader__ = self return module _wrap(set_loader_wrapper, fxn) @@ -623,6 +628,81 @@ def _find_module_shim(self, fullname): return loader +def _validate_bytecode_header(data, source_stats=None, name=None, path=None): + """Validate the header of the passed-in bytecode against source_stats (if + given) and returning the bytecode that can be compiled by compile(). + + All other arguments are used to enhance error reporting. + + ImportError is raised when the magic number is incorrect or the bytecode is + found to be stale. EOFError is raised when the data is found to be + truncated. + + """ + exc_details = {} + if name is not None: + exc_details['name'] = name + else: + # To prevent having to make all messages have a conditional name. + name = '<bytecode>' + if path is not None: + exc_details['path'] = path + magic = data[:4] + raw_timestamp = data[4:8] + raw_size = data[8:12] + if magic != _MAGIC_BYTES: + message = 'bad magic number in {!r}: {!r}'.format(name, magic) + _verbose_message(message) + raise ImportError(message, **exc_details) + elif len(raw_timestamp) != 4: + message = 'incomplete timestamp in {!r}'.format(name) + _verbose_message(message) + raise EOFError(message) + elif len(raw_size) != 4: + message = 'incomplete size in {!r}'.format(name) + _verbose_message(message) + raise EOFError(message) + if source_stats is not None: + try: + source_mtime = int(source_stats['mtime']) + except KeyError: + pass + else: + if _r_long(raw_timestamp) != source_mtime: + message = 'bytecode is stale for {!r}'.format(name) + _verbose_message(message) + raise ImportError(message, **exc_details) + try: + source_size = source_stats['size'] & 0xFFFFFFFF + except KeyError: + pass + else: + if _r_long(raw_size) != source_size: + raise ImportError("bytecode is stale for {!r}".format(name), + **exc_details) + return data[12:] + + +def _compile_bytecode(data, name=None, bytecode_path=None, source_path=None): + """Compile bytecode as returned by _validate_bytecode_header().""" + code = marshal.loads(data) + if isinstance(code, _code_type): + _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_bytecode(code, mtime=0, source_size=0): + """Compile a code object into bytecode for writing out to a byte-compiled + file.""" + data = bytearray(_MAGIC_BYTES) + data.extend(_w_long(mtime)) + data.extend(_w_long(source_size)) + data.extend(marshal.dumps(code)) + return data # Loaders ##################################################################### @@ -755,7 +835,7 @@ class WindowsRegistryFinder: def _open_registry(cls, key): try: return _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, key) - except WindowsError: + except OSError: return _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, key) @classmethod @@ -769,7 +849,7 @@ class WindowsRegistryFinder: try: with cls._open_registry(key) as hkey: filepath = _winreg.QueryValue(hkey, "") - except WindowsError: + except OSError: return None return filepath @@ -801,52 +881,6 @@ class _LoaderBasics: tail_name = fullname.rpartition('.')[2] return filename_base == '__init__' and tail_name != '__init__' - def _bytes_from_bytecode(self, fullname, data, bytecode_path, source_stats): - """Return the marshalled bytes from bytecode, verifying the magic - number, timestamp and source size along the way. - - If source_stats is None then skip the timestamp check. - - """ - magic = data[:4] - raw_timestamp = data[4:8] - raw_size = data[8:12] - if magic != _MAGIC_BYTES: - msg = 'bad magic number in {!r}: {!r}'.format(fullname, magic) - _verbose_message(msg) - raise ImportError(msg, name=fullname, path=bytecode_path) - elif len(raw_timestamp) != 4: - message = 'bad timestamp in {}'.format(fullname) - _verbose_message(message) - raise EOFError(message) - elif len(raw_size) != 4: - message = 'bad size in {}'.format(fullname) - _verbose_message(message) - raise EOFError(message) - if source_stats is not None: - try: - source_mtime = int(source_stats['mtime']) - except KeyError: - pass - else: - if _r_long(raw_timestamp) != source_mtime: - message = 'bytecode is stale for {}'.format(fullname) - _verbose_message(message) - raise ImportError(message, name=fullname, - path=bytecode_path) - try: - source_size = source_stats['size'] & 0xFFFFFFFF - except KeyError: - pass - else: - if _r_long(raw_size) != source_size: - raise ImportError( - "bytecode is stale for {}".format(fullname), - name=fullname, path=bytecode_path) - # Can't return the code object as errors from marshal loading need to - # propagate even when source is available. - return data[12:] - @module_for_loader def _load_module(self, module, *, sourceless=False): """Helper for load_module able to handle either source or sourceless @@ -861,12 +895,9 @@ class _LoaderBasics: module.__cached__ = module.__file__ else: module.__cached__ = module.__file__ - module.__package__ = name if self.is_package(name): module.__path__ = [_path_split(module.__file__)[0]] - else: - module.__package__ = module.__package__.rpartition('.')[0] - module.__loader__ = self + # __package__ and __loader set by @module_for_loader. _call_with_frames_removed(exec, code_object, module.__dict__) return module @@ -876,8 +907,10 @@ class SourceLoader(_LoaderBasics): def path_mtime(self, path): """Optional method that returns the modification time (an int) for the specified path, where path is a str. + + Raises IOError when the path cannot be handled. """ - raise NotImplementedError + raise IOError def path_stats(self, path): """Optional method returning a metadata dict for the specified path @@ -888,6 +921,7 @@ class SourceLoader(_LoaderBasics): - 'size' (optional) is the size in bytes of the source code. Implementing this method allows the loader to read bytecode files. + Raises IOError when the path cannot be handled. """ return {'mtime': self.path_mtime(path)} @@ -905,9 +939,7 @@ class SourceLoader(_LoaderBasics): """Optional method which writes data (bytes) to a file path (a str). Implementing this method allows for the writing of bytecode files. - """ - raise NotImplementedError def get_source(self, fullname): @@ -916,7 +948,7 @@ class SourceLoader(_LoaderBasics): path = self.get_filename(fullname) try: source_bytes = self.get_data(path) - except IOError as exc: + except OSError as exc: raise ImportError("source not available through get_data()", name=fullname) from exc readsource = _io.BytesIO(source_bytes).readline @@ -932,6 +964,14 @@ class SourceLoader(_LoaderBasics): raise ImportError("Failed to decode source file", name=fullname) from exc + 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 _call_with_frames_removed(compile, data, path, 'exec', + dont_inherit=True, optimize=_optimize) + def get_code(self, fullname): """Concrete implementation of InspectLoader.get_code. @@ -948,45 +988,34 @@ class SourceLoader(_LoaderBasics): else: try: st = self.path_stats(source_path) - except NotImplementedError: + except IOError: pass else: source_mtime = int(st['mtime']) try: data = self.get_data(bytecode_path) - except IOError: + except OSError: pass else: try: - bytes_data = self._bytes_from_bytecode(fullname, data, - bytecode_path, - st) + bytes_data = _validate_bytecode_header(data, + source_stats=st, name=fullname, + path=bytecode_path) except (ImportError, EOFError): pass else: _verbose_message('{} matches {}', bytecode_path, source_path) - found = marshal.loads(bytes_data) - if isinstance(found, _code_type): - _imp._fix_co_filename(found, source_path) - _verbose_message('code object from {}', - bytecode_path) - return found - else: - msg = "Non-code object in {}" - raise ImportError(msg.format(bytecode_path), - name=fullname, path=bytecode_path) + return _compile_bytecode(bytes_data, name=fullname, + bytecode_path=bytecode_path, + source_path=source_path) source_bytes = self.get_data(source_path) - code_object = _call_with_frames_removed(compile, - source_bytes, source_path, 'exec', - dont_inherit=True) + code_object = self.source_to_code(source_bytes, source_path) _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): - data = bytearray(_MAGIC_BYTES) - data.extend(_w_long(source_mtime)) - data.extend(_w_long(len(source_bytes))) - data.extend(marshal.dumps(code_object)) + source_mtime is not None): + data = _code_to_bytecode(code_object, source_mtime, + len(source_bytes)) try: self._cache_bytecode(source_path, bytecode_path, data) _verbose_message('wrote {!r}', bytecode_path) @@ -1045,13 +1074,7 @@ class SourceFileLoader(FileLoader, SourceLoader): def _cache_bytecode(self, source_path, bytecode_path, data): # Adapt between the two APIs - try: - mode = _os.stat(source_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 + mode = _calc_mode(source_path) return self.set_data(bytecode_path, data, _mode=mode) def set_data(self, path, data, *, _mode=0o666): @@ -1093,14 +1116,8 @@ class SourcelessFileLoader(FileLoader, _LoaderBasics): def get_code(self, fullname): path = self.get_filename(fullname) data = self.get_data(path) - bytes_data = self._bytes_from_bytecode(fullname, data, path, None) - found = marshal.loads(bytes_data) - if isinstance(found, _code_type): - _verbose_message('code object from {!r}', path) - return found - else: - raise ImportError("Non-code object in {}".format(path), - name=fullname, path=path) + bytes_data = _validate_bytecode_header(data, name=fullname, path=path) + return _compile_bytecode(bytes_data, name=fullname, bytecode_path=path) def get_source(self, fullname): """Return None as there is no source code.""" @@ -1422,7 +1439,7 @@ class FileFinder: lower_suffix_contents.add(new_name) self._path_cache = lower_suffix_contents if sys.platform.startswith(_CASE_INSENSITIVE_PLATFORMS): - self._relaxed_path_cache = set(fn.lower() for fn in contents) + self._relaxed_path_cache = {fn.lower() for fn in contents} @classmethod def path_hook(cls, *loader_details): @@ -1443,7 +1460,7 @@ class FileFinder: return path_hook_for_FileFinder def __repr__(self): - return "FileFinder(%r)" % (self.path,) + return "FileFinder({!r})".format(self.path) # Import itself ############################################################### @@ -1548,7 +1565,7 @@ def _find_and_load_unlocked(name, import_): except AttributeError: pass # Set loader if need be. - if not hasattr(module, '__loader__'): + if getattr(module, '__loader__', None) is None: try: module.__loader__ = loader except AttributeError: @@ -1709,7 +1726,7 @@ def _setup(sys_module, _imp_module): module_type = type(sys) for name, module in sys.modules.items(): if isinstance(module, module_type): - if not hasattr(module, '__loader__'): + if getattr(module, '__loader__', None) is None: if name in sys.builtin_module_names: module.__loader__ = BuiltinImporter elif _imp.is_frozen(name): @@ -1723,7 +1740,7 @@ def _setup(sys_module, _imp_module): builtin_module = sys.modules[builtin_name] setattr(self_module, builtin_name, builtin_module) - os_details = ('posix', ['/']), ('nt', ['\\', '/']), ('os2', ['\\', '/']) + os_details = ('posix', ['/']), ('nt', ['\\', '/']) for builtin_os, path_separators in os_details: # Assumption made in _path_join() assert all(len(sep) == 1 for sep in path_separators) @@ -1734,9 +1751,6 @@ def _setup(sys_module, _imp_module): else: try: os_module = BuiltinImporter.load_module(builtin_os) - # TODO: rip out os2 code after 3.3 is released as per PEP 11 - if builtin_os == 'os2' and 'EMX GCC' in sys.version: - path_sep = path_separators[1] break except ImportError: continue @@ -1758,7 +1772,7 @@ def _setup(sys_module, _imp_module): setattr(self_module, '_thread', thread_module) setattr(self_module, '_weakref', weakref_module) setattr(self_module, 'path_sep', path_sep) - setattr(self_module, 'path_separators', set(path_separators)) + setattr(self_module, 'path_separators', ''.join(path_separators)) # Constants setattr(self_module, '_relax_case', _make_relax_case()) EXTENSION_SUFFIXES.extend(_imp.extension_suffixes()) |