您可以定义一个自定义类型，
argparse.ArgumentTypeError如果字符串与所需的格式不匹配，则会引发。
def SpecialString(v): fields = v.split(":") # Raise a value error for any part of the string # that doesn't match your specification. Make as many # checks as you need. I've only included a couple here # as examples. if len(fields) != 5: raise argparse.ArgumentTypeError("String must have 5 fields") elif not (1 <= int(fields[2]) <= 10): raise argparse.ArgumentTypeError("Field 3 must be between 1 and 10, inclusive") else: # If all the checks pass, just return the string as is return vgroup_simulate.add_argument('-P', type=SpecialString, help='simulate FC port down', nargs=1, metavar='fc_port_name', dest='simulate')更新：这是一个完整的自定义类型，用于检查值。所有检查都是在正则表达式中完成的，尽管如果任何部分出错，它只会给出一条通用错误消息。
def SpecialString(v): import re # Unless you've already imported re previously try: return re.match("^1:m:([1-9]|10):p:(1|2|3|4)$", v).group(0) except: raise argparse.ArgumentTypeError("String '%s' does not match required format"%(v,))
