fix Python pandas errors

Author: jeanbez

explorer/dxt.py

@@ -298,7 +298,7 @@ def create_dataframe(
                 temp_result["end"] = temp_result["end"].round(decimals=4)
 
                 temp_result.index.name = "segment"
-                temp_result.reset_index(inplace=True)
+                temp_result = temp_result.reset_index()
                 temp_result = temp_result.reindex(columns=column_names)
 
                 df.append(temp_result)
@@ -327,7 +327,7 @@ def create_dataframe(
                 temp_result["end"] = temp_result["end"].round(decimals=4)
 
                 temp_result.index.name = "segment"
-                temp_result.reset_index(inplace=True)
+                temp_result = temp_result.reset_index()
                 temp_result = temp_result.reindex(columns=column_names)
 
                 df.append(temp_result)
@@ -513,7 +513,8 @@ def merge_overlapping_io_phases(self, overlapping_df, df, module):
                     threshold,
                 ]
 
-        io_phases_df.dropna(inplace=True)
+        io_phases_df = io_phases_df.dropna()
+
         return io_phases_df
 
     def calculate_io_phases(

explorer/plots/operation.py

@@ -229,8 +229,8 @@ def determine_legend(fig, column):
 if df.empty:
     quit()
 
-df["osts"].fillna(value="-", inplace=True)
-df.drop(df.tail(2).index, inplace=True)
+df["osts"] = df["osts"].fillna("-")
+df = df.iloc[:-2] # TODO: review why this is needed
 
 if not options["graph_type"]:
     if options["start"] is not None: