python获取参数的写法

import getopt

optargs = sys.argv[1:]
try:
    opts, args = getopt.getopt(optargs, "f:b:r:", ["file=", "backdays=", "region="])
except getopt.GetoptError as err:
    sys.stderr.write("[ERROR] Invalid Syntax\n")
    sys.exit(1)

for opt, arg in  opts:
    if opt in ("-f", "--file"):
        pnl_file = arg
    elif opt in ("-b", "--backdays"):
        backdays = int(arg)
    elif opt in ("-r", "--region="):
        region = arg