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"""Subset of importlib.abc used to reduce importlib.util imports."""

from . import _bootstrap

import abc

class Loader(metaclass=abc.ABCMeta):

"""Abstract base class for import loaders."""

def create_module(self, spec):

"""Return a module to initialize and into which to load.

This method should raise ImportError if anything prevents it

from creating a new module. It may return None to indicate

that the spec should create the new module.

"""

# By default, defer to default semantics for the new module.

return None

# We don't define exec_module() here since that would break

# hasattr checks we do to support backward compatibility.

def load_module(self, fullname):

"""Return the loaded module.

The module must be added to sys.modules and have import-related

attributes set properly. The fullname is a str.

ImportError is raised on failure.

This method is deprecated in favor of loader.exec_module(). If

exec_module() exists then it is used to provide a backwards-compatible

functionality for this method.

"""

if not hasattr(self, 'exec_module'):

raise ImportError

# Warning implemented in _load_module_shim().

return _bootstrap._load_module_shim(self, fullname)