def METHOD_NAME(self) -> str:
    """
    Create gzip(max compression) compressed file
    """
    options = [
        '-9'
    ]
    if self.keep_source:
        options.append('--keep')
    Command.run(
        ['gzip', '-f'] + options + [self.source_filename]
    )
    self.compressed_filename = self.source_filename + '.gz'
    return self.compressed_filename