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- """Utilities for providing backward compatibility."""
- from pip._vendor import six
- def get_exc_info_from_future(future):
- """
- Get an exc_info value from a Future.
- Given a a Future instance, retrieve an exc_info value suitable for passing
- in as the exc_info parameter to logging.Logger.log() and related methods.
- On Python 2, this will be a (type, value, traceback) triple.
- On Python 3, this will be an exception instance (with embedded traceback).
- If there was no exception, None is returned on both versions of Python.
- """
- if six.PY3:
- return future.exception()
- else:
- ex, tb = future.exception_info()
- if ex is None:
- return None
- return type(ex), ex, tb
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