PYTHON:Validate Password Strength
Check if a password is strong based on length and character type rules.
Python Program Code
This program helps you to learn the fundamental structure and syntax of Python programming.
# Program to validate password strength
import re
password = input("Enter a password: ")
length_ok = len(password) >= 8
has_upper = re.search(r"[A-Z]", password) is not None
has_lower = re.search(r"[a-z]", password) is not None
has_digit = re.search(r"[0-9]", password) is not None
has_special = re.search(r"[^A-Za-z0-9]", password) is not None
if length_ok and has_upper and has_lower and has_digit and has_special:
print("Strong password")
else:
print("Weak password")Enter a password: Abc@1234 Strong password
Understanding Validate Password Strength
We use regular expressions to ensure the password contains:
and is at least 8 characters long.
Note: To write and run Python programs, you need to set up the local environment on your computer. Refer to the complete article Setting up Python Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your Python programs.
Practical Learning Notes for Validate Password Strength
This Python program is part of the "Conditional Programs" topic and is designed to help you build real problem-solving confidence, not just memorize syntax. Start by understanding the goal of the program in plain language, then trace the logic line by line with a custom input of your own. Once you can predict the output before running the code, your understanding becomes much stronger.
A reliable practice pattern is to run the original version first, then modify only one condition or variable at a time. Observe how that single change affects control flow and output. This deliberate style helps you understand loops, conditions, and data movement much faster than copying full solutions repeatedly.
For interview preparation, explain this solution in three layers: the high-level approach, the step-by-step execution, and the time-space tradeoff. If you can teach these three layers clearly, you are ready to solve close variations of this problem under time pressure.