7- Strong Password Generator.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 number should be at least 8.")

            user_input = input("Please, Enter your number again: ")

        else:

            break

    except:

        print("Please, Enter numbers only.")

        user_input = input("How many characters do you want in your password? ")


# 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 result
random.shuffle(result)


# join result
password = "".join(result)
print(password)