pivot table - Django-Chartit2 'dict_keys' object does not support indexing error -

i exploring django chartit2 package charting purpose following demo examples provided here. have created own model pivot charts contains fields: city, person , sales.

in views creating pivotchart making use of term based on aggregation of sales column.

while trying accessing url getting error:

exception type: typeerror @ /chart/pivotpool/

exception value: 'dict_keys' object not support indexing

let me know missing while specifying terms pivotchart.

class saleshistory(models.model):     city = models.charfield(max_length=50)     person = models.charfield(max_length=50)     sales_qty = models.integerfield()  def some_view(request):     ds = pivotdatapool(series=[{'options': {'source': saleshistory.objects.all(), 'categories': ['city']},     'terms': {'total_sales': sum('sales_qty')}}])     pivchrt = pivotchart(datasource=ds, series_options=[{'options': {'type': 'column', 'stacking': true}, 'terms':['total_sales']}], chart_options = {}) 

my traceback:

 traceback: file "/home/sam/documents/onemoreenv/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response   149.                     response = self.process_exception_by_middleware(e, request)  file "/home/sam/documents/onemoreenv/lib/python3.4/site-packages/django/core/handlers/base.py" in get_response   147.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)  file "/home/sam/documents/lab projects/djangochartit/demochartit/views.py" in some_view   131.                        'text': 'city'}}})  file "/home/sam/documents/onemoreenv/lib/python3.4/site-packages/chartit/charts.py" in __init__   508.         self.set_default_hcoptions()  file "/home/sam/documents/onemoreenv/lib/python3.4/site-packages/chartit/charts.py" in set_default_hcoptions   533.         categories = dss[terms[0]]['categories'] 

the terms being used in set_default_hcoptions function in charts.py file of chartit has no attribute index, thats reason giving error me. have commented line gets initialised i.e.

# terms = self.series_options.keys() 

and have added own version of it:

terms = list(self.series_options) 

and worked me.