month_days = [0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] def is_leap(year): """Return True for leap years, False for non-leap year.""" return year % 4 == 0 and (year % 100 != 0 or year % 400 == 0) def days_in_month(year, month): """Returns the days in a month during the designated year) if not 1 <= month <= 12: return 'Invalid Month' if month == 2 and is_leap(year): return 29 return month_days[month]
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