The linecache module in Example 13-13 is used to read lines from module source code. It caches recently visited modules (the entire source file, actually).

File: linecache-example-1.py

import linecache

print linecache.getline("linecache-example-1.py", 5)

print linecache.getline("linecache-example-1.py", 5)

This module is used by the traceback module.