StopIteration: Iterator Exhausted

Why This Happens

Iterators raise StopIteration when exhausted. For loops handle this automatically, but manual next() calls do not.

The Problem

it = iter([1, 2])
next(it); next(it); next(it)  # StopIteration

The Fix

it = iter([1, 2])
value = next(it, None)  # Returns None when exhausted

Step-by-Step Fix

1. 1

   Use next() with default

   Call next(iterator, default_value).

2. 2

   Use for loops

   For loops handle StopIteration automatically.

3. 3

   Check before consuming

   Convert to list and check length if needed.