as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
write a function to find out whether a given year is a leap year or not.
user
def is_leap_year(year):
    if year % 400 == 0:
        return true
    elif year % 100 == 0:
        return false
    elif year % 4 == 0:
        return true
    else:
        return false
assistant