Python Program to Check Leap Year

A leap year is a calendar year in which an additional day is added to February month. In a leap year, the number of days in February month and the year are 29 and 366 respectively. A year that is not a leap year is called a common year. A year is said to be a leap year if:

• it is divisible by 4.
• it is divisible by 4 but not divisible by 100.
• it is divisible by 4, 100 and 400.

Method 1: Using conditional statements

In the example below, conditional statements are used to identify a leap year.

year = 2019
if year % 400 == 0:
  print(year, "is a leap year.")
elif year % 100 == 0:
  print(year, "is not a leap year.")
elif year % 4 == 0:
  print(year, "is a leap year.")
else:
  print(year, "is not a leap year.")

The above code will give the following output:

2019 is not a leap year.

Method 2: Using function

In the example below, a function called leapyear() is created which takes year as argument and prints whether the passed year is a leap year or not.

def leapyear(year):
  if year % 400 == 0:
    print(year, "is a leap year.")
  elif year % 100 == 0:
    print(year, "is not a leap year.")
  elif year % 4 == 0:
    print(year, "is a leap year.")
  else:
    print(year, "is not a leap year.") 

leapyear(2019)

The above code will give the following output:

2019 is not a leap year.