Update app.py

app.py

@@ -141,14 +141,12 @@ def main():
 
     if uploaded_file is not None:
         try:
-            # Step 1: Read the Excel file into a DataFrame
-            df = pd.read_excel(uploaded_file)
-
-            # Step 2: Rename duplicate columns to make them unique
-            cols = pd.Series(df.columns)
-            for dup in cols[cols.duplicated()].unique():
-                cols[cols[cols == dup].index.values.tolist()] = [f"{dup}_{i+1}" if i != 0 else dup for i in range(sum(cols == dup))]
-            df.columns = cols
+            # Step 1: Read the Excel file into a DataFrame and automatically rename duplicate columns
+            df = pd.read_excel(uploaded_file, mangle_dupe_cols=True)
+
+            # Step 2: Rename duplicate columns to make them more readable if needed
+            # Columns will already be unique, e.g., "Student Attendance [J]", "Student Attendance [J].1"
+            df.columns = [col.replace(".1", "_2").replace(".2", "_3") for col in df.columns]
 
             # Step 3: Replace student names with initials
             df = replace_student_names_with_initials(df)