How to Append Rows to CSV Efficiently in Python?

Efficient CSV Row Appending in Python

When working with CSV files in Python, it's essential to maintain and update them efficiently. Suppose you want to append new rows to an existing CSV file. You may encounter the dilemma of choosing between your current approach and seeking a better one.

Originally, you stored old CSV rows in a list, deleted the original file, and recreated it with the updated list. While this method functions, it's not the most optimal solution.

A far more efficient approach involves using the 'a' parameter when opening the CSV file. By specifying 'a' for the 'mode' argument of the open() function, you enable append mode. This allows you to write to the end of the file without overwriting its contents.

Here's an example that demonstrates this technique:

<code class="python">with open('document.csv','a') as fd:
    fd.write(myCsvRow)</code>

In this code, we open the 'document.csv' file with append mode and write the 'myCsvRow' to the end of the file. This approach is much more efficient as it doesn't require deleting and recreating the file, saving both time and resources.

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