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__init__.py5.9 KB · 177 lines
"""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 moduleimport sys try:    import _frozen_importlib as _bootstrapexcept 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_externalexcept ImportError:    from . import _bootstrap_external    _bootstrap_external._setup(_bootstrap)    _bootstrap._bootstrap_external = _bootstrap_externalelse:    _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 typesimport 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