cmdoptions.py 文件源码

def only_binary():
    return Option(
        "--only-binary", dest="format_control", action="callback",
        callback=_handle_only_binary, type="str",
        default=FormatControl(set(), set()),
        help="Do not use source packages. Can be supplied multiple times, and "
             "each time adds to the existing value. Accepts either :all: to "
             "disable all source packages, :none: to empty the set, or one or "
             "more package names with commas between them. Packages without "
             "binary distributions will fail to install when this option is "
             "used on them.")