strong_passgen_for_prod.py

# import modules
import string
import random

# store all characters in lists
s1 = list(string.ascii_lowercase)
s2 = list(string.ascii_uppercase)
s3 = list(string.digits)
s4 = list(string.punctuation)

# Ask user about the number of characters
user_input = input("How many characters do you want in your password? ")

# check this input is it number? is it more than 8?
while True:
    try:
        characters_number = int(user_input)
        if characters_number < 8:
            print("Your password must be at least 8 characters long")
            user_input = input("Please, Enter your number again: ")
        else:
            break
    except:
        print("Please, Enter a number")
        user_input = input("Please, Enter your number again: ")

# shuffle all lists
random.shuffle(s1)
random.shuffle(s2)
random.shuffle(s3)
random.shuffle(s4)

# calculate 30% & 20% of number of characters
part1 = round(characters_number * (30 / 100))
part2 = round(characters_number * (20 / 100))

# generation of the password (60% letters and 40% digits & punctuations)
result = []

for x in range(part1):
    result.append(s1[x])
    result.append(s2[x])

for x in range(part2):
    result.append(s3[x])
    result.append(s4[x])

# shuffle the result
random.shuffle(result)

# join the result
password = "".join(result)
print("Strong Password: ", password)