python - Choosing certain months between two datetime objects -

i trying choose day in january , july of every year spanning period between 2 datetime objects (row['orig_iss_dt'] , row['maturity_dt']) , insert them my_dict. since, row['maturity_dt'] in dataframe df multiple of 6 months today (july), thought code below this. however, isn't working expected date's in months of april, may , june. i've tested monthdelta function , works expected.

# number of months between 2 datetime objects def monthdelta(d1, d2):     delta = 0     while true:         mdays = monthrange(d1.year, d1.month)[1]         d1 += timedelta(days=mdays)         if d1 <= d2:             delta += 1         else:             break     return delta  #trying pick out jan , july between 2 datetimes , insert them dict (i,row) in df.iterrows():     my_dict = {}     date = datetime.datetime.strptime(row['maturity_dt'], '%y-%m-%d %h:%m:%s.%f') #setting date maturity date     count = 0     k in range(monthdelta(datetime.datetime.strptime(row['orig_iss_dt'], '%y-%m-%d %h:%m:%s.%f'), datetime.datetime.strptime(row['maturity_dt'], '%y-%m-%d %h:%m:%s.%f')), 0, -6):         #list_of_coupons.append(row.coupon)          date -= datetime.timedelta(6*30) #reducing maturity date till reaches orig_iss_dt         print(date)         count = count + 1         my_dict[count] = date 

thank you

some thoughts solution:

1) "date -= datetime.timedelta(6*30)"

we use line date year = 2015, month = 1, day = 30

dt = datetime.datetime(year=2015,month=1,day = 30)      in range(5):            dt -= datetime.timedelta(6*30)            print dt 

we get:

2014-08-03 00:00:00 2014-02-04 00:00:00 2013-08-08 00:00:00 2013-02-09 00:00:00 2012-08-13 00:00:00 

it not july.

2) recommend library "monthdelta" http://pythonhosted.org/monthdelta/ fix problem this:

for k in range(monthdelta(datetime.datetime.strptime(row['orig_iss_dt'], '%y-%m-%d %h:%m:%s.%f'), datetime.datetime.strptime(row['maturity_dt'], '%y-%m-%d %h:%m:%s.%f')), 0, -6):         #list_of_coupons.append(row.coupon)          date -= monthdelta.monthdelta(-6) #reducing maturity date till reaches orig_iss_dt         print(date)         count = count + 1         my_dict[count] = date 

3) in case:

count = count + 1 my_dict[count] = date 

with code never write in my_dict[0]