list_versions.py 文件源码

def _usage(error_message=None):
    if error_message:
        stderr.write('ERROR: ' + error_message + linesep)
    stdout.write(
        linesep.join([
            'Usage:', '    list_versions.py [OPTION]... [DEPENDENCY]',
            'Examples:', '    list_versions.py go',
            '    list_versions.py -r docker',
            '    list_versions.py --rc docker',
            '    list_versions.py -l kubernetes',
            '    list_versions.py --latest kubernetes', 'Options:',
            '-l/--latest Include only the latest version of each major and'
            ' minor versions sub-tree.',
            '-r/--rc     Include release candidate versions.',
            '-h/--help   Prints this!', ''
        ]))