How to run a function multiple times?

I’m trying to write a code that outputs a username and a password

import string, random

def random_string(length=9, uppercase=True, lowercase=True, numbers=True):
    character_set = ''

    if uppercase:
        character_set += string.ascii_uppercase
    if lowercase:
        character_set += string.ascii_lowercase
    if numbers:
        character_set += string.digits

    return ''.join(random.choice(character_set) for i in range(length))


username = random_string(9)

for num in range(30):
    password = f'{random.randint(100, 999)}{random.randint(100, 999)}{random.randint(100, 999)}'

print(f'{username}\n{password}')

This works on my end, but the problem I’m trying to solve is how do I let this run 30 times?

So I can get 30 different pairs of usernames and passwords.

>Solution :

If you want a collection of 30 random usernames and passwords, a list comprehension should serve nicely.

For instance:

[f'{random_string(9)}: {random.randint(100, 199)}' for _ in range(30)]

Obviously you can tweak this to generate the usernames and passwords howver you want, but it will give you a list of 30 of them that you can then use as you please.