xin zeng get_days function #1019
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ef get_days(year, month):
"""
获取指定年份和月份的天数
"""
if month in {1, 3, 5, 7, 8, 10, 12}:
return 31
elif month in {4, 6, 9, 11}:
return 30
elif month == 2:
if is_leap(year):
return 29
else:
return 28
else:
return None # 对于非法的月份返回 None