|  | @@ -300,13 +300,13 @@ class Clean(setuptools.Command):
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				|  |  |      description = 'Clean build artifacts.'
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				|  |  |      user_options = []
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				|  |  |  
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				|  |  | -    _FILE_PATTERNS = [
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				|  |  | +    _FILE_PATTERNS = (
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				|  |  |          'python_build',
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				|  |  |          'src/python/grpcio/__pycache__/',
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				|  |  |          'src/python/grpcio/grpc/_cython/cygrpc.cpp',
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				|  |  |          'src/python/grpcio/grpc/_cython/*.so',
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				|  |  |          'src/python/grpcio/grpcio.egg-info/',
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				|  |  | -    ]
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				|  |  | +    )
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				|  |  |      _CURRENT_DIRECTORY = os.path.normpath(
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				|  |  |          os.path.join(os.path.dirname(os.path.realpath(__file__)), "../../.."))
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				|  |  |  
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