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importlib
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Editing: __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._setup(_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 types 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 find_loader(name, path=None): """Return the loader for the specified module. This is a backward-compatible wrapper around find_spec(). This function is deprecated in favor of importlib.util.find_spec(). """ warnings.warn('Deprecated since Python 3.4. ' 'Use importlib.util.find_spec() instead.', DeprecationWarning, stacklevel=2) try: loader = sys.modules[name].__loader__ if loader is None: raise ValueError('{}.__loader__ is None'.format(name)) else: return loader except KeyError: pass except AttributeError: raise ValueError('{}.__loader__ is not set'.format(name)) from None spec = _bootstrap._find_spec(name, path) # We won't worry about malformed specs (missing attributes). if spec is None: return None if spec.loader is None: if spec.submodule_search_locations is None: raise ImportError('spec for {} missing loader'.format(name), name=name) raise ImportError('namespace packages do not have loaders', name=name) return spec.loader 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: msg = ("the 'package' argument is required to perform a relative " "import for {!r}") raise TypeError(msg.format(name)) 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. """ if not module or not isinstance(module, types.ModuleType): raise TypeError("reload() argument must be a module") try: name = module.__spec__.name except AttributeError: name = module.__name__ if sys.modules.get(name) is not module: msg = "module {} not in sys.modules" raise ImportError(msg.format(name), 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: msg = "parent {!r} not in sys.modules" raise ImportError(msg.format(parent_name), 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
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