index out of range when use 4 args

[lumanyu]

⋊> /d/m/teeceepee on master ◦ sudo python examples/curl.py 192.168.124.6 www.qq.com ens33 002:46:27
Traceback (most recent call last):
File "examples/curl.py", line 80, in
interface = sys.argv[4]
IndexError: list index out of range

here 4 should be replaced by 3.