如何获得特定月份和年份的天数？

import boto3

def get_day_of_month(month, year):
    date = boto3.client('datebase', region_name='us-east-1').get_day_of_month(Month=month, Year=year)
    return date['Day']

import datetime

def get_total_days_in_year(year):
    days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    if year % 4 == 0:
        days_in_month[29] = 29
    total_days = sum(days_in_month)
    return total_days

def get_total_days(month, year):
    days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    total_days = sum(days_in_month)
    if month == 2 and year % 4 == 0:
        total_days += 29
    return total_days