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Generating Strong Password using Python

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  • Difficulty Level : Easy
  • Last Updated : 27 Jan, 2022

Having a weak password is not good for a system that demands high confidentiality and security of user credentials. It turns out that people find it difficult to make up a strong password that is strong enough to prevent unauthorized users from memorizing it. 

This article uses a mixture of numbers, alphabets, and other symbols found on the computer keyboard to form a 12-character password which is unpredictable and cannot easily be memorized. 

  • The components of the password are represented in the form of arrays.
  • Use the random method to select at least one character from each array of characters.
  • Since the 12-character password is required, so fill the rest of the length of the password left with randomly selected characters from an array formed from the combination of all the characters needed in the final password. Anytime the password is generated, shuffle the password using random.shuffle() to ensure that the final password does not follow a particular pattern.


import random
import array
# maximum length of password needed
# this can be changed to suit your password length
MAX_LEN = 12
# declare arrays of the character that we need in out password
# Represented as chars to enable easy string concatenation
DIGITS = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
LOCASE_CHARACTERS = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
                     'i', 'j', 'k', 'm', 'n', 'o', 'p', 'q',
                     'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
UPCASE_CHARACTERS = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
                     'I', 'J', 'K', 'M', 'N', 'O', 'P', 'Q',
                     'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
SYMBOLS = ['@', '#', '$', '%', '=', ':', '?', '.', '/', '|', '~', '>',
           '*', '(', ')', '<']
# combines all the character arrays above to form one array
# randomly select at least one character from each character set above
rand_digit = random.choice(DIGITS)
rand_upper = random.choice(UPCASE_CHARACTERS)
rand_lower = random.choice(LOCASE_CHARACTERS)
rand_symbol = random.choice(SYMBOLS)
# combine the character randomly selected above
# at this stage, the password contains only 4 characters but
# we want a 12-character password
temp_pass = rand_digit + rand_upper + rand_lower + rand_symbol
# now that we are sure we have at least one character from each
# set of characters, we fill the rest of
# the password length by selecting randomly from the combined
# list of character above.
for x in range(MAX_LEN - 4):
    temp_pass = temp_pass + random.choice(COMBINED_LIST)
    # convert temporary password into array and shuffle to
    # prevent it from having a consistent pattern
    # where the beginning of the password is predictable
    temp_pass_list = array.array('u', temp_pass)
# traverse the temporary password array and append the chars
# to form the password
password = ""
for x in temp_pass_list:
        password = password + x
# print out password

Output : 



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