Sometimes, sorting by a single column isn’t enough—what if two rows have the same month number? In that case, you can add a secondary sorting criterion. For example, if you want to break ties by sorting based on column 0 as well, you can do this:
df = df.sort_values(by=[2, 0]) # Sort by month number, then by the first column
This ensures that if two months are the same, the sorting will fall back to column 0 for ordering. A small but powerful trick in pandas sort by column when dealing with more complex data!