local_file_uri2.py

@staticmethod
def local_file_uri(file_path):
    '''
    Helper/Utility method to take file system paths and return a file URI for use
    with learn, and learn_policy methods
    
    Args:
        file_path: The file path to the policy
        
    Returns:
        an equivalent file URI
    '''
    if os.path.isfile(file_path):
        try:
            with open(file_path):
                pass

        except IOError:
            raise IOError('Cannot open and read rules file, %s' % file_path)

    else:
        raise IOError('Cannot find rules file, %s' % file_path)

    full_path = urllib.pathname2url(os.path.abspath(file_path))
    if file_path.startswith("file://"):
        return full_path

    else:
        return "file://" + full_path