diff --git a/sunglass/materials.py b/sunglass/materials.py
index da4a16b..96e7774 100644
--- a/sunglass/materials.py
+++ b/sunglass/materials.py
@@ -96,7 +96,6 @@ def print_properties(self, *args):
 
 
 if __name__ == "__main__":
-
     valid_materials = sorted(solcore.ParameterSystem().database.sections())
     valid_materials.remove("Immediate Calculables")
     valid_materials.remove("Final Calculables")
diff --git a/sunglass/plot.py b/sunglass/plot.py
index 298a5a2..1c2eac8 100644
--- a/sunglass/plot.py
+++ b/sunglass/plot.py
@@ -54,7 +54,6 @@ def plot_dark_iv(self, data: pd.DataFrame) -> None:
         """
 
         for name in data.columns.values:
-
             # Plotting tunnel junctions IV
             if "J_TJ" in name:
                 label = "Isolated {}".format(name.split("_")[1])
@@ -121,7 +120,6 @@ def plot_light_iv(self, data: pd.DataFrame, spectrum: LightSource) -> None:
             self.outputs["eta"] = self.outputs["mpp"] / spectrum.power_density
 
         for name in data.columns.values:
-
             # Plotting tunnel junctions IV. Actually, we need to review this as TJ have
             # opposite polarity than
             # normal J and therefore should look more like Rs.
diff --git a/sunglass/save_data.py b/sunglass/save_data.py
index b7eca3a..ed0ab16 100644
--- a/sunglass/save_data.py
+++ b/sunglass/save_data.py
@@ -46,7 +46,6 @@ def save_qe_data(root_filename, output):
     qe_data = OrderedDict({"WL": output.wavelength, "R": output.reflected})
 
     for j in range(len(output)):
-
         # All layers and junctions have defined a fraction of absorbed light, except
         # some TJ and 2D kind of
         # junctions. We try to get that, first.
@@ -84,7 +83,6 @@ def save_bandstructure_data(root_filename, output, task):
     tsk = "{}_data".format(task)
 
     for j in output.junction_indices:
-
         # Only junctions have information on bandstructure, and not all the models, so
         # we take that into account.
         try: