[Solved] how to make If statement and for loop work for an empty variable

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shouldn’t it be something like this?

import urllib
import argparse

def download_web_image(url):
    IMAGE = url.rsplit("https://stackoverflow.com/",1)[1]
    urllib.urlretrieve(url, IMAGE)

parser = argparse.ArgumentParser()
parser.add_argument("num1")
parser.add_argument("num2")
parser.add_argument("num3")
args = parser.parse_args()

num3 = args.num3

if not num3:
    for num3 in range(01,50):
        download_web_image("https://www.example.com/{num1}/{num2}/{num3}.jpg".format(num1=args.num1, num2=args.num2, num3=num3))
else:
    download_web_image("https://www.example.com/{num1}/{num2}/{num3}.jpg".format(num1=args.num1, num2=args.num2, num3=num3))

your complete code is (sorry) a mess.. first you have to define variables before using them. num3 is not defined in your code, but you check, with if not num3:. And then you use num3 as a variabe in a for-loop – doesn’t make any sense to me

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solved how to make If statement and for loop work for an empty variable