human
Solve the following python programming problem given the following code:
def month_view(request, year, month, template = 'swingtime/monthly_view.html', queryset = None) : 
    '
    Render a tradional calendar grid view with temporal navigation variables.

    Context parameters:
    
    ``today``
        the current datetime.datetime value
        
    ``calendar``
        a list of rows containing (day, items) cells, where day is the day of
        the month integer and items is a (potentially empty) list of occurrence
        for the day
        
    ``this_month``
        a datetime.datetime representing the first day of the month
    
    ``next_month``
        this_month + 1 month
    
    ``last_month``
        this_month - 1 month
    
    ' 
    (year, month) = (int (year), int (month)) 
    cal = calendar.monthcalendar (year, month) 
    dtstart = datetime (year, month, 1) 
    last_day = max (cal [(- 1)]) 
    dtend = datetime (year, month, last_day) 
    queryset = (queryset._clone () if (o is not None) else Occurrence.objects.select_related ()) 
    occurrences = queryset.filter (start_time__year = year, start_time__month = month) 
    def start_day(o) : 
        return o.start_time.day 
by_day = dict ([(dt, list (o)) for (dt, o) in itertools.groupby (occurrences, start_day)]) 
    data = { 
        'today' : datetime.now (), 
        'calendar' : [[(d, by_day.get (d, [])) for d in row] for row in cal], 
        'this_month' : dtstart, 
        'next_month' : (dtstart + timedelta (days = (+ last_day))), 
        'last_month' : (dtstart + timedelta (days = (- 1))), 
} 
    return render (request, template, data) 

    
    

    Fix the buggy line: queryset = (queryset._clone () if (o is not None) else Occurrence.objects.select_related ())
assistant
#Here is Python code to fix the buggy line: queryset = (queryset.

queryset = (queryset._clone () if (queryset is not None) else Occurrence.objects.select_related ())