관리-도구
편집 파일: __init__.py
"""A pure Python implementation of import.""" __all__ = ['__import__', 'import_module', 'invalidate_caches', 'reload'] # Bootstrap help ##################################################### # Until bootstrapping is complete, DO NOT import any modules that attempt # to import importlib._bootstrap (directly or indirectly). Since this # partially initialised package would be present in sys.modules, those # modules would get an uninitialised copy of the source version, instead # of a fully initialised version (either the frozen one or the one # initialised below if the frozen one is not available). import _imp # Just the builtin component, NOT the full Python module import sys try: import _frozen_importlib as _bootstrap except ImportError: from . import _bootstrap _bootstrap._setup(sys, _imp) else: # importlib._bootstrap is the built-in import, ensure we don't create # a second copy of the module. _bootstrap.__name__ = 'importlib._bootstrap' _bootstrap.__package__ = 'importlib' try: _bootstrap.__file__ = __file__.replace('__init__.py', '_bootstrap.py') except NameError: # __file__ is not guaranteed to be defined, e.g. if this code gets # frozen by a tool like cx_Freeze. pass sys.modules['importlib._bootstrap'] = _bootstrap try: import _frozen_importlib_external as _bootstrap_external except ImportError: from . import _bootstrap_external _bootstrap_external._set_bootstrap_module(_bootstrap) _bootstrap._bootstrap_external = _bootstrap_external else: _bootstrap_external.__name__ = 'importlib._bootstrap_external' _bootstrap_external.__package__ = 'importlib' try: _bootstrap_external.__file__ = __file__.replace('__init__.py', '_bootstrap_external.py') except NameError: # __file__ is not guaranteed to be defined, e.g. if this code gets # frozen by a tool like cx_Freeze. pass sys.modules['importlib._bootstrap_external'] = _bootstrap_external # To simplify imports in test code _pack_uint32 = _bootstrap_external._pack_uint32 _unpack_uint32 = _bootstrap_external._unpack_uint32 # Fully bootstrapped at this point, import whatever you like, circular # dependencies and startup overhead minimisation permitting :) import warnings # Public API ######################################################### from ._bootstrap import __import__ def invalidate_caches(): """Call the invalidate_caches() method on all meta path finders stored in sys.meta_path (where implemented).""" for finder in sys.meta_path: if hasattr(finder, 'invalidate_caches'): finder.invalidate_caches() def import_module(name, package=None): """Import a module. The 'package' argument is required when performing a relative import. It specifies the package to use as the anchor point from which to resolve the relative import to an absolute import. """ level = 0 if name.startswith('.'): if not package: raise TypeError("the 'package' argument is required to perform a " f"relative import for {name!r}") for character in name: if character != '.': break level += 1 return _bootstrap._gcd_import(name[level:], package, level) _RELOADING = {} def reload(module): """Reload the module and return it. The module must have been successfully imported before. """ try: name = module.__spec__.name except AttributeError: try: name = module.__name__ except AttributeError: raise TypeError("reload() argument must be a module") if sys.modules.get(name) is not module: raise ImportError(f"module {name} not in sys.modules", name=name) if name in _RELOADING: return _RELOADING[name] _RELOADING[name] = module try: parent_name = name.rpartition('.')[0] if parent_name: try: parent = sys.modules[parent_name] except KeyError: raise ImportError(f"parent {parent_name!r} not in sys.modules", name=parent_name) from None else: pkgpath = parent.__path__ else: pkgpath = None target = module spec = module.__spec__ = _bootstrap._find_spec(name, pkgpath, target) if spec is None: raise ModuleNotFoundError(f"spec not found for the module {name!r}", name=name) _bootstrap._exec(spec, module) # The module may have replaced itself in sys.modules! return sys.modules[name] finally: try: del _RELOADING[name] except KeyError: pass