Python list of first day of month for given period

Question

I am trying find an efficient way of creating a list of dates only including the first day of the month for a given period. Something like this but better:

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Answer 1

Try pandas.date_range() with the 'MS' (Month Start) frequency alias:

import pandas as pd

start = '2020-01-01'
end = '2020-12-01'

dates = pd.date_range(start, end, freq='MS')

print(dates)

Result:

DatetimeIndex(['2020-01-01', '2020-02-01', '2020-03-01', '2020-04-01',
               '2020-05-01', '2020-06-01', '2020-07-01', '2020-08-01',
               '2020-09-01', '2020-10-01', '2020-11-01', '2020-12-01'],
              dtype='datetime64[ns]', freq='MS')

A list of all frequency aliases can be found here.