Check Leap Year

In this lab, you are tasked with writing a Python function named is_leap_year. This function should determine whether a given year is a leap year. A leap year is defined by the following rules:

• A year is a leap year if it is divisible by 4.
• However, if the year is also divisible by 100, it is not a leap year unless it is divisible by 400.

Your function should take a single input (the year) and return a boolean value: True if the year is a leap year, and False otherwise.

Examples:

1. Input: is_leap_year(2000)
   Expected Output: True
   Explanation: 2000 is divisible by 400, so it is a leap year.

2. Input: is_leap_year(1997)
   Expected Output: False
   Explanation: 1997 is not divisible by 4, so it is not a leap year.

Remember to write clean, readable code and test your function thoroughly to ensure it meets the criteria.