How do I append a row to a pandas DataFrame?

How do I append a row to a pandas DataFrame?

You can use the append() method to add a row to a DataFrame. For example, df.append(new_row, ignore_index=True).

What if I want to append multiple rows at once?

You can pass a list of dictionaries or another DataFrame to the append() method. For example, df.append([row1, row2], ignore_index=True).

Is there a way to do this without using append?

Yes, you can use pd.concat() to concatenate DataFrames. For example, pd.concat([df, new_rows], ignore_index=True).

What are the performance implications of using append?

Using append() in a loop can be slow because it creates a new DataFrame each time. It's better to collect rows in a list and use pd.concat() once.