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Replace 'package' parameter as 'anchor' and warn about the change.
Other errors should fall through.
>>> files('a', 'b')
Traceback (most recent call last):
TypeError: files() takes from 0 to 1 positional arguments but 2 were given
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exception (i.e. ``FileNotFoundError``) when the
directory doesn't exist. This function wraps that call
to always return a boolean and only return True
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path on the local file system in a context manager.
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to the file system in a context manager.
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