Update app.py

app.py

@@ -410,23 +410,27 @@ def analyze_z_test(file):
     
     return result_dataframes
 
-def join_dataframes(mlist ,dataframes):
+def join_dataframes(mlist, dataframes):
     max_rows = max(df.shape[0] for df in dataframes)
     result = pd.DataFrame()
-    i = 1
-    for df in dataframes:
+    col_counts = {}  # Dictionary to track column name occurrences
+
+    for i, df in enumerate(dataframes):
         rows_to_add = max_rows - df.shape[0]
         if rows_to_add > 0:
-            # Create a DataFrame with empty rows
             empty_rows = pd.DataFrame(index=range(rows_to_add), columns=df.columns)
-            #Fill empty rows with np.nan
             empty_rows = empty_rows.fillna(np.nan)
-
             df = pd.concat([df, empty_rows], ignore_index=True)
-        if not result.empty:
-          result = pd.concat([result, pd.DataFrame(columns=[mlist[i]])], axis=1)
-          i += 1
 
+        for col in df.columns:
+            original_col = col
+            count = 1
+            while col in result.columns:
+                col = f"{original_col}_{count}"
+                count += 1
+            col_counts[original_col] = col_counts.get(original_col, 0) + 1
+            df = df.rename(columns={original_col: col})
+        
         result = pd.concat([result, df.reset_index(drop=True)], axis=1)
 
     return result