[Django]-Django data to Google Charts

according to the data table definition in the code, there are three columns…

var data = new google.visualization.DataTable();
data.addColumn('string', 'Month');
data.addColumn('number');
data.addColumn('number');

but from reading the question, sounds like you only need two…

var data = new google.visualization.DataTable();
data.addColumn('string', 'Month');
data.addColumn('number');

and to add a single row of values, the format should be…

['Month', 0]

to add all the rows, using addRows, the format should be…

[
  ['Month',   0],
  ['Month',  12],
  ['Month', -12]
]

In your views context, change 'data' : data to 'data': json.dumps(data)

It is crucial to use json either in javascript, or in view.