python script that generates a custom wordlist

Question

I'm trying to write a script that generates a custom wordlist.

Instructions

• It has to be between 8-15 characters

• Alphanumeric characters

• Will contain a combination of the three full key words: NOSAM, ESYC, UMG

• Any other characters prepended/appended to the key words will be numerical

• Always has these numbers:

20 21 22 23 24

• This includes uppercase and lower-case permutations: (ex: esYc, NOSam, Umg)

• Randomize the capitalization of words

• The numbers go in between, before, and after the key words as well

Examples:

• Nosam20umG23

• 2220ESYcumG

• ESyc24Nosam20

• EsycNOSAMUMG

• noSAM21UMg

from random import choice
from itertools import product
import string
min_len = int(input('Enter minimum length of password: '))
max_len = int(input('Enter maximum length of password: '))
counter = 0
key_word = ['NOSAM', 'ESYC', 'UMG'] + ['20', '21', '22', '23', '24']
key_word = ''.join(choice((str.upper, str.lower))(i) for i in key_word)

charater = key_word
file_open = open("wordlist.txt", 'w')
for i in range(min_len,max_len+1):
    for j in product(charater, repeat = i):
        word = "".join(j)
        file_open.write(word)
        file_open.write('\n')
        counter += 1
    print("Wordlist of {} passwords created".format(counter))