def columnCount(self, index=QtCore.QModelIndex()):
        return len(self.headers)
Adds the value to the existing values in the dictionary, if any.
dataset/ETHPy150Open datalyze-solutions/pandas-qt/pandasqt/models/ColumnDtypeModel.py/ColumnDtypeModel.columnCount--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/datastore.py/_AddOrAppend