Automatic Password Generator Using Python

By Sandra Marin Rajesh

This is an automatic password generator which gives passwords to the user depending on the number of characters they want in their password.

Steps to execute: 

1. On running the program, they user is asked the number of passwords they want to generate. 

2.On entering the number of passwords, the application then asks the numeber of characters they want in each of the paswords. 

3. On entering the the details the passwords are displayed to the user.

This application could be used to improve security. 

import random

def generatePassword(pwlength):

    alphabet = "abcdefghijklmnopqrstuvwxyz"

    passwords = [] 

    for i in pwlength:
        
        password = "" 
        for j in range(i):
            next_letter_index = random.randrange(len(alphabet))
            password = password + alphabet[next_letter_index]
        
        password = replaceWithNumber(password)
        password = replaceWithUppercaseLetter(password)
        
        passwords.append(password) 
    
    return passwords


def replaceWithNumber(pword):
    for i in range(random.randrange(1,3)):
        replace_index = random.randrange(len(pword)//2)
        pword = pword[0:replace_index] + str(random.randrange(10)) + pword[replace_index+1:]
        return pword


def replaceWithUppercaseLetter(pword):
    for i in range(random.randrange(1,3)):
        replace_index = random.randrange(len(pword)//2,len(pword))
        pword = pword[0:replace_index] + pword[replace_index].upper() + pword[replace_index+1:]
        return pword



def main():
    
    numPasswords = int(input("How many passwords do you want to generate? "))
    
    print("Generating " +str(numPasswords)+" passwords")
    
    passwordLengths = []

    print("Minimum length of password should be 3")

    for i in range(numPasswords):
        length = int(input("Enter the length of Password #" + str(i+1) + " "))
        if length<3:
            length = 3
        passwordLengths.append(length)
    
    
    Password = generatePassword(passwordLengths)

    for i in range(numPasswords):
        print ("Password #"+str(i+1)+" = " + Password[i])



main()

OUTPUT:

How many passwords do you want to generate? 3
Generating 3 passwords
Minimum length of password should be 3
Enter the length of Password #1 7
Enter the length of Password #2 3
Enter the length of Password #3 10
Password #1 = 1niLlin
Password #2 = 3sT
Password #3 = glpa2zuPjm

OUTPUT