Stack jan and feb into one DataFrame with a fresh 0..n index. Store it in result.
import pandas as pd
jan = pd.DataFrame({"order_id": [1, 2], "amount": [500, 700]})
feb = pd.DataFrame({"order_id": [3, 4, 5], "amount": [300, 900, 100]})Store your final answer in a variable named result.
Run your code to see the output here.