Programación python sacar primer día y ultimo día del mes

import datetime
import calendar

today=datetime.datetime.now()

dateMonthStart=»%s-%s-01″ % (today.year, today.month)
dateMonthEnd=»%s-%s-%s» % (today.year, today.month, calendar.monthrange(today.year-1, today.month-1)[1])

print «primer dia del mes: %s» % dateMonthStart
print «segundo dia del mes: %s» % dateMonthEnd