Easy to understand:

def is_leap(year):
    leap = False
    if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
        leap = True
    return leap

from calendar import isleap

def is_leap(year): leap = False

# Write your logic here
#it is wrong in one case not successful
# if year % 4==0:
#     leap = True
# elif year % 100==0:
#     leap
# elif year % 400==0:
#     leap = True

#leap = isleap(year) only muggle use this

#logic batman know!
if (year % 4==0) and (year % 100!=0):
    leap=True
elif (year % 100==0) and (year % 400!=0):
    leap = False
elif (year % 400==0):
    leap = True
else:
    leap



return leap

year = int(input()) print(is_leap(year))

def is_leap(year): leap = False

# Write your logic here

if (year % 400 == 0 ):
    leap = True

elif (year % 100 == 0):
    leap = False

elif (year % 4 == 0):
    leap = True

return leap

# return leap

year = int(input()) print(is_leap(year))

def is_leap(year): leap = False

# Write your logic here
if year % 4 == 0:
    return True
else:
    return False
if year % 100 != 0:
    return True
else:
    return False
if year % 400 == 0:
    return True
else:
    return Falsewhy i can't do 

def is_leap(year): leap = False

# Write your logic here
if (year %100 == 0 and year % 400 !=0) or year % 4 !=0:

    return leap
else : 
    leap = True 
    return leap

year = int(input()) print(is_leap(year))