How to use 'python file readable' in Python

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def _file_is_python(path):
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    # type: (str) -> bool
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    if path.endswith('.py'):
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        return True
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    _, extension = os.path.splitext(path)
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    if extension:
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        return False
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    try:
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        with open(path) as might_be_python:
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            line = might_be_python.readline()
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            return line.startswith('#!') and 'python' in line
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    except UnicodeDecodeError:
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        return False

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def readable(self) -> bool:
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    return False