random_password_gen.py

import random
import math

alpha = "abcdefghijklmnopqrstuvwxyz"
num = "0123456789"
special = "@#$%&*"

# pass_len=random.randint(8,13)  #without User INput
pass_len = int(input("Enter Password Length"))

# length of password by 50-30-20 formula
alpha_len = pass_len//2
num_len = math.ceil(pass_len*30/100)
special_len = pass_len-(alpha_len+num_len)


password = []


def generate_pass(length, array, is_alpha=False):
    for i in range(length):
        index = random.randint(0, len(array) - 1)
        character = array[index]
        if is_alpha:
            case = random.randint(0, 1)
            if case == 1:
                character = character.upper()
        password.append(character)


# alpha password
generate_pass(alpha_len, alpha, True)
# numeric password
generate_pass(num_len, num)
# special Character password
generate_pass(special_len, special)
# suffle the generated password list
random.shuffle(password)
# convert List To string
gen_password = ""
for i in password:
    gen_password = gen_password + str(i)
print(gen_password)