Kpi calculators

Created by: stefanoborini

Introduces a basic implementation of the KPI calculators.

force_bdss/core_plugins/csv_extractor/csv_extractor/csv_extractor_data_source.py

@@ -15,9 +15,9 @@ class CSVExtractorDataSource(BaseDataSource):
                 if rowindex == self.model.row:
                     return DataSourceResult(
                         originator=self,
-                        value_types = [self.model.cuba_type],
+                        value_types=[self.model.cuba_type],
                         values=numpy.array(
-                            float(row[self.model.column])).reshape(1,1)
+                            row[self.model.column]).reshape(1, 1)
                     )
 
                 return None