Program to find leap Year or not in Python

 What is a Leap year ?

Generally  we have 28 days in the month of February and overall 365 days in a year. But a leap year have 29 days in the month of February and overall 366 days in a year. For every four years we get a leap year.

Conditions to be a leap Year.

Year divisible by 4 is a leap year until it is not divisible by 100 (century year{year ends with 00} is not a leap year until it is divisible by 400, if it is divisible by 400 then it is a leap year.

Explanation : 

• For a non century year  if year divisible by 4 then it is a leap year.

  For a non century year  if year not divisible by 4 then it is not a leap year.

• If year is a century year then it is not a leap year.

• Century year is said to be a leap year if it is divisible by 400 .
  

Input :

enter a year 2400

Output : 

2400 is a leap year 

Program to find leap Year or not in Python

#program to say leap year or not
year=int(input("enter a year "))
if year%4==0:
    if year%100==0:
        if year%400==0:
            print(year,"is a leap year.")
        else:
            print(year,"is not a leap year.")
    else:
        print(year,"is a leap year.")
else:
    print(year,"is not a leap year.")
    
#----method 2------using ternary operator---------#
year=int(input())
print("leap year"if (year%4==0) else "not a leap year")

Output :

enter a year 2400
2400 is a leap year.