Python gets the number of days in the previous month

[Python] Code     

# Simple little program
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