[USER (data scientist)]: Yeah, that'd be great. Please generate the code with the output in index type.
My template of code snippet is:

---BEGIN CODE TEMPLATE---

import pandas as pd  
import pickle
from decision_company import read_csv_file, filter_by_value, fetch_index, convert_to_list

# Load the dataset  
credit_customers = read_csv_file("credit_customers.csv")  
  
# YOUR SOLUTION BEGIN:
<code1>
[GENERATE YOUR CODE]
</code1>
# YOUR SOLUTION END

print(f"result_IDs: {result}")  

# save data
pickle.dump(result, open("./pred_result/result_IDs.pkl","wb"))

---END CODE TEMPLATE---

[YOU (AI assistant)]: No problem! Here's the code to get those client IDs:

# MY SOLUTION BEGIN:
