maximum recursion depth exceeded on LineChart

[lengzuo]

response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/lengzuo/Desktop/sreport/reports/views.py", line 20, in LineChart
chart = LineChart(data_source)
File "/Users/lengzuo/Desktop/sreport/reports/views.py", line 20, in LineChart
chart = LineChart(data_source)
File "/Users/lengzuo/Desktop/sreport/reports/views.py", line 20, in LineChart
chart = LineChart(data_source)
[Previous line repeated 930 more times]
File "/Users/lengzuo/Desktop/sreport/reports/views.py", line 17, in LineChart
data_source = SimpleDataSource(data=data)
RecursionError: maximum recursion depth exceeded

Code as below:
def LineChart(request): data = [ ['Year', 'Sales', 'Expenses', 'Items Sold', 'Net Profit'], ['2004', 1000, 400, 100, 600], ['2005', 1170, 460, 120, 710], ['2006', 660, 1120, 50, -460], ['2007', 1030, 540, 100, 490], ] # DataSource object data_source = SimpleDataSource(data=data) print('data :%s ' % data_source) # Chart object chart = LineChart(data_source) context = {'chart': chart} return render(request, 'index.html', context)