Issue on passwd generator

I have issue with a code for generate password (code below)

from random import randint, choice

alphabet_min = [chr(i) for i in range(97, 123)]
alphabet_maj = [chr(i) for i in range(65, 91)]
chiffre = [chr(i) for i in range(48, 58)]
carac_spec = [chr(i) for i in range(33, 48)]


def pwd(n, min1=True, maj=True, chif= True, cs=True):
    alphabets = dict()
    key = 0
    if min1:
        alphabets[key] = alphabet_min
        key += 1
    if maj:
        alphabets[key] = alphabet_maj
        key += 1
    if chif:
        alphabets[key] = chiffre
        key += 1
    if cs:
        alphabets[key] = carac_spec
        key += 1

    mdp = ' '
    for i in range(n):
        clef = randint(0, key - 1)
        mdp += choice(alphabets[clef])

    return mdp

When I execute this, nothing appear

Code finding on internet and very beginner in Python code.

Anyone have an idea of the issue ?