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Change to the following:
In your view file:
def month(request, year=1, month=1, change="None"):
In your url file:
url(r'^month/(?P<year>\d{4})/(?P<month>\d{2})/(?P<change>\w+)/$', 'courseCalendar.views.month', name="month"),
After you change to the above, post here the error message if you’re receiving an error.
Source:stackexchange.com