Code

from random import random
from random import randrange
from random import randint
letters = "abcdefghijklmnopqrstuvwxyz"
numbers = "0123456789"
rand_letters = []
running = True
num = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
let_2 = randrange(6, 12)
num_2 = randrange(1, 3)
rand_num = []
while running:
    print("Select your operator: \n"
          "1) Generate your email\n"
          "2) Exit")
    choice = input()
    if choice == "1":
        print("Choose your domain:\n"
              "1) gmail.com\n"
              "2) yahoo.com\n"
              "3) yandex.com")
        domain_choice = input()
        initial = 0
        if domain_choice == "1":
            domain = "@gmail.com"
            while initial != let_2:
                let_3 = randint(0, 9)
                num_3 = randint(0, 9)
                rand_num.append(letters[num_3])
                rand_letters.append(letters[let_3])
                initial = initial + 1