# Python Program to Check Leap Year

To understand this example, you should have the knowledge of the following Python programming topics:

A leap year is exactly divisible by 4 except for century years (years ending with 00). The century year is a leap year only if it is perfectly divisible by 400. For example,

```2017 is not a leap year
1900 is a not leap year
2012 is a leap year
2000 is a leap year
```

## Source Code

``````# Python program to check if year is a leap year or not

year = 2000

# To get year (integer input) from the user
# year = int(input("Enter a year: "))

# divided by 100 means century year (ending with 00)
# century year divided by 400 is leap year
if (year % 400 == 0) and (year % 100 == 0):
print("{0} is a leap year".format(year))

# not divided by 100 means not a century year
# year divided by 4 is a leap year
elif (year % 4 ==0) and (year % 100 != 0):
print("{0} is a leap year".format(year))

# if not divided by both 400 (century year) and 4 (not century year)
# year is not leap year
else:
print("{0} is not a leap year".format(year))``````

Output

```2000 is a leap year
```

You can change the value of year in the source code and run it again to test this program.

Before we wrap up, let's put your understanding of this example to the test! Can you solve the following challenge?

Challenge:

Write a function to calculate the number of leap years between two given years.

• Hint: A year is considered a leap year if it is divisible by 4, but not by 100, unless it is also divisible by 400.
• For example, for inputs 2000 and 2020, the output should be 6.