In [1]: import datetime

In [2]: import locale

In [3]: locale.setlocale(locale.LC_ALL,'fr_FR')
Out[3]: 'fr_FR'

In [4]: datetime.datetime(2015,7,1).strftime('%B')
Out[4]: 'juillet'

In [5]: locale.setlocale(locale.LC_ALL,'en_US')
Out[5]: 'en_US'

In [6]: datetime.datetime(2015,7,1).strftime('%B')
Out[6]: 'July'