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Learn how to build a simple password validation function in Python without using regular expressions. This guide provides a clear solution to common validation issues.
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Creating a Password Validation Function in Python

When developing applications, ensuring the security of user accounts is a top priority. One crucial aspect of security is confirming that users create strong passwords. In this guide, we will discuss how to create a simple function in Python to validate passwords without using regular expressions or a main() function. This will help you grasp fundamental programming concepts while building a practical tool.

The Problem: Password Validation

The goal of password validation is to check whether a given password meets specific security criteria. Here are the criteria we'll be implementing in our function:

Minimum length of 10 characters

At least 3 digits

At least 1 uppercase letter

At least 1 lowercase letter

At least 1 special character (such as @ , # , $, etc.)

A common issue encountered while learning Python is using methods incorrectly, leading to errors. For instance, the error TypeError: str.isdigit() takes no arguments (1 given) often occurs when developers incorrectly pass arguments to the isdigit() method.

The Solution: Correcting the Function

Let's work on a corrected version of the password validation function. Here's how we can break it down and implement it:

Step 1: Define the Function

We'll start by defining a function named isValidPassword that takes a password string (pw) as an argument.

Step 2: Initialize Validation Criteria

Next, we will declare a list of special characters and a boolean variable val to track whether the password passes all criteria.

Step 3: Check Each Criteria

We'll use conditions to evaluate whether the provided password meets the requirements. If any condition fails, we adjust the val variable and print the corresponding message. Importantly, we must replace the any() function call with a summation for digit checks. Here’s the corrected function:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Test the Function

Finally, you can test the function by passing various password strings to ensure it correctly assesses their validity. The print statements will guide you in understanding which criteria have failed.

Conclusion

Creating a password validation function in Python is a valuable exercise in understanding how to apply logic and conditions in your code. By following the steps outlined above, you will not only improve your coding skills but also enhance your applications' security. Remember to always test your functions thoroughly and enjoy the learning process as you navigate through Python programming.