title: How to find out if DST was effective for some date in Python?
body: <p>I have following data: geographical coordinates of the place and local date and time, not necessarily current, may point to some moment many years ago. I also may have non-DST time zone effective currently, at present time (but  not necessarily correct for the date and time of interest). 
  I want to find out whether DST was in effect in that location at that local time using Python. Any ideas how to do that? I was reading about package pytz, but could not find anything suitable in it to complete that.</p>