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30 lines
991 B
Python
30 lines
991 B
Python
"""Utilities for with-statement contexts. See PEP 343."""
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import abc
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import _collections_abc
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try:
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from contextlib import AbstractContextManager
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except ImportError:
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# Copied from python3.7 library as "backport"
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class AbstractContextManager(abc.ABC):
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"""An abstract base class for context managers."""
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def __enter__(self):
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"""Return `self` upon entering the runtime context."""
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return self
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@abc.abstractmethod
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def __exit__(self, exc_type, exc_value, traceback):
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"""Raise any exception triggered within the runtime context."""
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return None
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@classmethod
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def __subclasshook__(cls, C):
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"""Check whether subclass is considered a subclass of this ABC."""
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if cls is AbstractContextManager:
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return _collections_abc._check_methods(C, "__enter__",
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"__exit__")
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return NotImplemented
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