django - name 'context' is not defined -

i try use view create table (which later want populate data). if open respective url view creates "name 'context' not defined" error. can explain?

def room_overview(request, year, month):     rooms = room.objects.all()     long_month = ['01', '03', '05', '07', '08', '10', '12']     short_month = ['04','06','09','11']     if month in long_month:         month_max = 31     elif month in short_month:         month_max = 30     elif year % 4 == 0 , year %100 != 0 or year % 400 == 0:         month_max = 29     else:         month_max = 28      days = []     in range(1, month_max + 1):         days.append(str(i))      context['rooms'] = rooms     context['days'] = days     context['month'] = month     context['year'] = year      return render(request, 'hotel/overview.html', context) 

the template view looks this:

<h2>overview {{month}}/{{year}}:</h2> <div class="overview"> <table class="table table-condensed">     <tr>         {% day in days %}         <th>day</th>         {% endfor %}     </tr>  {% room in rooms %} <tr>     <td>{{ room.name }}</td>     {% day in days %}     <td> 1 </td>     {% endfor %} </tr> {% endfor %} </table> </div> 

this url entry:

url(r'^room/overview/(?p<year>[0-9]{4})/(?p<month>[0-9]{2})/$',views.room_overview, name='room_overview'), 

you must define context variable first before add key/value pairs.

you can this:

context = {} context['rooms'] = rooms context['days'] = days context['month'] = month context['year'] = year 

or, way prefer:

context = {     'rooms': rooms,      'days': days,     'month': month,     'year': year, } 

and solve error.