whats wrong in this code

Question

def is_leap(year):

leap = False
if (year%4) == 0:
return True
return leap
year = int(input())
print(is_leap(year))

Answer 1

It should be
if(year%4 == 0):
leap = True
return leap

Answer 2

def isLeapYear(year):
if int(year) % 4 == 0:
return True
else:
return False

Answer 3

its showing invalid character!!