How to write a program that check validity of the password : <p>'''    How to write a Python program to check the validity of password input by users.
    Allow a user 3 attempts, on the 4th one exit the program(Google is your friend :)).</p>

<pre><code>Validation : 
•At least 1 letter between [a-z] and ta least one letter between [A-Z]. 
•At least 1 number between [0-9].
•At least 1 character from [$#@].
•Minimum length 6 characters.
•Maximum length 16 characters. 
</code></pre>

<p>'''</p>
