Python gets the number of days in the previous month

[Python] Code

#简单小程序
from datetime import datetime
import calendar
 
def getMonths():
    d = datetime.now()
    c = calendar.Calendar()
     
    year = d.year
    month = d.month
     
    if month == 1 :
        month = 12
        year -= 1
    else :
        month -= 1
    months = calendar.monthrange(year, month)[1]    
    return months