Update app.py

app.py

@@ -37,6 +37,7 @@ def get_well_position(sample_index):
     col_number = ((sample_index - 1) % 12) + 1              # 12 columns
     return f"{row_letter}{col_number}"
 
+
 def get_plate_id(sample_index):
     """Return Plate number based on 96 samples per plate"""
     plate_number = math.ceil(sample_index / 96)
@@ -163,14 +164,15 @@ if not df_binary.empty:
     source_wells = generate_source_wells(df_robot.shape[1] - 1)
 
     for i, col in enumerate(df_robot.columns[1:]):
-        for _, sample in df_robot.iterrows():
+        for row_idx, sample in df_robot.iterrows():
             if sample['# donors'] == 0:
                 continue  # skip samples with no donors
             if int(sample[col]) == 1:
                 sample_id = int(sample['Sample'])
-                plate = get_plate_id(sample_id)
+                sample_index = row_idx + 1
+                plate = get_plate_id(sample_index)
                 source = source_wells[i]
-                dest = get_well_position(sample_id)
+                dest = get_well_position(sample_index)
                 vol = round(sample['volume donors (µL)'], 2)
                 tool = 'TS_50' if vol > 10 else 'TS_10'
                 robot_script.append({