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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def __get_docker_file_path(path):
    '''
    Determines the filepath to use

    :param path:
    :return:
    '''
    if os.path.isfile(path):
        return path
    for dc_filename in DEFAULT_DC_FILENAMES:
        file_path = os.path.join(path, dc_filename)
        if os.path.isfile(file_path):
            return file_path