Day 1 - Python

Let's start the first program with the most common Password Checker!

Create a program that prompts the user to input a password and checks if it meets the criteria: at least 8 characters long, containing at least one uppercase letter, one lowercase letter, and one symbol from {!@#$%^&*()-+}. Then, print "Valid password" if it meets the criteria, otherwise print "Invalid password".

Problem Statement: Password Validation

Design a program that verifies whether a given string password meets enhanced criteria. The enhanced criteria for a valid password are as follows:

• The password must be at least 8 characters long.
• The password must contain at least one uppercase letter.
• The password must contain at least one lowercase letter.
• The password must contain at least one symbol from the set {!@#$%^&*()-+}.

Your task is to implement a program that takes a string password as input and checks if it meets the specified enhanced criteria. If the password meets the criteria, the program should print "Valid password"; otherwise, it should print "Invalid password".

Input:

A string representing the password.

Output:

"Valid password" if the password meets the enhanced criteria.

"Invalid password" if the password does not meet the enhanced criteria.

Note:

Assume that the password contains only printable ASCII characters.

Example:

Input: "Passw0rd!"

Output: "Valid password"

Input: "abc123"

Output: "Invalid password"

SOLUTION

import re

pwd = input("Enter your password: ")

if len(pwd) >= 8 and re.search("[a-z]", pwd) and re.search("[A-Z]", pwd) and re.search("[!@#$%^&*()-+]", pwd):

    print("Valid password")

else:

    print("Invalid password")

Insights

• This coding used the Regular Expression Module.
• Revise the concepts of logical operators. Understand the difference between 'and' and 'or'
• Read the documentation of the Regular Expression https://docs.python.org/3/howto/regex.html. Explore more functions!
• Try exploring to check for spaces.
• Explore with this piece of code, without re module, as one single problem can be solved in n number of ways! Try exploring various methods!

if len(pwd) >= 8 and any(char.isdigit() for char in pwd) and any(char.isalpha() for char in pwd)

Explore and Enjoy! :)