The execution of these commands in python 3.4.x (Windows 10 Home)

    import locale
    from datetime import datetime
    locale.setlocale(locale.LC_ALL, 'Spanish')
    datetime.strftime(datetime.now(), '%a %d %b %Y')

renders the output

    'Spanish_Spain.1252'
    'mar 07 jun 2016'

but with Python 3.5.x the output is

'Spanish_Spain.1252'
'ma. 07 jun. 2016'