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Learn how to create a password validation function in Python that checks for specific criteria, returning a Boolean value based on password strength.
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How to Validate Passwords in Python with a Custom Function def

Are you finding it difficult to get started with writing a password validation function in Python? If you are a newbie to programming and are looking for guidance on how to create a user-defined function (UDF) that validates passwords based on given criteria, you've come to the right place!

In this guide, we will break down the process of building a password validation function that fulfills specific requirements. The function will be designed to return True if the password meets all the criteria and False otherwise.

The Requirements for a Valid Password

Before we dive into the code, let’s outline the specific requirements that the password must satisfy:

Minimum length: The password must be at least 10 characters long.

Digit count: There must be at least 3 digits in the password.

Special character count: At least 3 special characters must be included.

Letter case: The password must contain at least 1 uppercase letter and 1 lowercase letter.

Step-by-Step Code Breakdown

1. Define the Function

To begin with, we need to define a function in Python using the def keyword. Let's call our function passwordValidity.

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2. Initialize Variables

Next, we will initialize counters for digits and special characters. We will also create a list of special characters that we will be looking for in the password.

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3. Check Password Length

We should first check if the password meets the minimum length requirement. If it does not, we can immediately return False.

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4. Count Digits and Special Characters

We will then iterate through each character in the password to count digits and special characters. Here’s how you can do it:

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5. Check for Uppercase and Lowercase Letters

Additionally, we need to ensure that the password contains at least one uppercase and one lowercase letter. We can use Python's built-in string methods for checking this.

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6. Validate Criteria and Return Result

At the end of our function, we combine all our checks to determine if the password is valid. If it meets all the specified requirements, we return True; otherwise, we return False.

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Full Code Example

Combining all the above steps, here’s what the final function looks like:

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Conclusion

By following these steps, you’ve created a robust password validation function in Python that can accurately assess the strength of a password based on specific criteria. Keep practicing, and soon you will become proficient in writing functions that solve various programming challenges!

Feel free to modify the criteria in your validation function to suit your needs, and remember to keep experimenting and learning!