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if year % 4 == 0:
        if year % 100 == 0:
            if year % 400 == 0:
                leap = True
            else:
                leap = False
        else:
            leap = True
    else:
        leap = False
            
    return leap

this the true logic

if (year%100==0):
    year /= 100
if (year%4==0):
    leap=True

It's not important to keep the value the same, it's going nowhere else, so modify it if it helps.

Here's the most efficient way I was able to come up with for this using boolean logic

def is_leap(year):
    return year % 4 == 0 and (year % 400 == 0 or year % 100 !=0)
year = int(input())
print(is_leap(year))

def is_leap(year): leap = False

# Write your logic here
if not year % 4:
    if not year % 100:
        return not year % 400
    leap = True

return leap