from datetime import datetime
month_first = '02.2015' # дата-строка
month_first_r = datetime.strptime(month_first,'%m.%Y') # расчётное значение
for i in range(1,15):
month_i = 0
print('month_'+str(i)+':', month_i)
from datetime import datetime, timedelta
import calendar
date = datetime.now()
days_in_month = calendar.monthrange(date.year, date.month)[1]
date += timedelta(days=days_in_month)
print(date)