How can I prepend a line to a file in Python?

Appending a Line to the Beginning of a File

Appending a line to the beginning of a file instead of the end can be challenging, as opening a file in append mode automatically writes at the file's end. However, there are two ways to achieve this:

1. Load the File into Memory

This method involves reading the entire file into memory, prepending the desired line, and then rewriting the file with the new content:

2. Use Fileinput Module

The fileinput module provides an alternative approach:

While the first method ensures control over the file's content, the second method's underlying mechanism and suitability for large files remain unclear.

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