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bzrlib/version.py
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    try:
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        from bzrlib.workingtree import WorkingTree
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        return WorkingTree.open_containing(__file__)[0]
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    except (errors.NotBranchError, errors.UnknownFormatError):
 
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    except (errors.NotBranchError, errors.UnknownFormatError,
 
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            errors.NoWorkingTree):
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        return None