speedtest.py 文件源码

def validate_optional_args(args):
    """Check if an argument was provided that depends on a module that may
    not be part of the Python standard library.

    If such an argument is supplied, and the module does not exist, exit
    with an error stating which module is missing.
    """
    optional_args = {
        'json': ('json/simplejson python module', json),
        'secure': ('SSL support', HTTPSConnection),
    }

    for arg, info in optional_args.items():
        if getattr(args, arg, False) and info[1] is None:
            raise SystemExit('%s is not installed. --%s is '
                             'unavailable' % (info[0], arg))