diff --git a/force_bdss/core_plugins/csv_extractor/csv_extractor/csv_extractor_data_source.py b/force_bdss/core_plugins/csv_extractor/csv_extractor/csv_extractor_data_source.py
index 7208153c407f679ab45978fa594415ce3cb7d67b..0d25380d7af689ff4f8f181e08c7d30c1bdc9d3b 100644
--- a/force_bdss/core_plugins/csv_extractor/csv_extractor/csv_extractor_data_source.py
+++ b/force_bdss/core_plugins/csv_extractor/csv_extractor/csv_extractor_data_source.py
@@ -15,10 +15,10 @@ 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(
                             parameters.values[0]+float(
-                                row[self.model.column])).reshape(1,1)
+                                row[self.model.column])).reshape(1, 1)
                     )
 
                 return None
diff --git a/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_calculator.py b/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_calculator.py
index c7554ff706b4557df8aea48ca29646a322bd9d19..3bb01b9b43cd74607e2f61994526988c9dc80670 100644
--- a/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_calculator.py
+++ b/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_calculator.py
@@ -17,7 +17,6 @@ class KPIAdderCalculator(BaseKPICalculator):
 
         return KPICalculatorResult(
             originator=self,
-            value_types = [self.model.cuba_type_out],
+            value_types=[self.model.cuba_type_out],
             values=numpy.array([sum])
         )
-
diff --git a/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_model.py b/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_model.py
index 066035c3f74ef0deb99eb113c486e5250fe02fe8..159f873cf4f255d07a708d68dfeb9ca55b2dafcf 100644
--- a/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_model.py
+++ b/force_bdss/core_plugins/test_kpi/kpi_adder/kpi_adder_model.py
@@ -1,4 +1,4 @@
-from traits.api import HasStrictTraits, Int, String
+from traits.api import HasStrictTraits, String
 
 
 class KPIAdderModel(HasStrictTraits):
diff --git a/force_bdss/data_sources/data_source_result.py b/force_bdss/data_sources/data_source_result.py
index 29b063eb0d87a434c26bbf5139fa251f033a2e48..b1208aec5ca1dc9217667c9009021344fd4be8c4 100644
--- a/force_bdss/data_sources/data_source_result.py
+++ b/force_bdss/data_sources/data_source_result.py
@@ -7,9 +7,9 @@ class DataSourceResult(HasTraits):
     """Represents the result of a simulator.
     It contains the resulting cuba key, the associated uncertainty and the
     originating simulator.
-    Difference between uncertainty and quality: uncertainty is a numerical value
-    of the value, as in the case of an experimental simulation.
-    quality is the level of accuracy of the (e.g.c omputational) method, as
+    Difference between uncertainty and quality: uncertainty is a numerical
+    value of the value, as in the case of an experimental simulation.
+    quality is the level of accuracy of the (e.g. computational) method, as
     the importance and reliability of that value. It should be an enumeration
     value such as HIGH, MEDIUM, POOR"""
     originator = Instance(BaseDataSource)
diff --git a/requirements/requirements.txt b/requirements/requirements.txt
index c332850d863ef40bc16bbf3b40b2b9f1b7fe8345..4896c1b4d5714200a4b3d43b45cae26a344c2fc6 100644
--- a/requirements/requirements.txt
+++ b/requirements/requirements.txt
@@ -2,4 +2,4 @@ envisage==4.6.0
 click==6.7
 six==1.10.0
 stevedore==1.24.0
-numpy=1.12.0
+numpy==1.12.0