Python's Walrus Operator: 3 Cases Where `:=` Actually Makes Your Code Better

This is valid Python. It's been valid since Python 3.8. And half the developers who see it for the first time think it's a bug.

Python's walrus operator := (assignment expression) lets you assign
a value inside an expression — assign AND use in one line.

3 practical use cases where it genuinely helps:
→ Chunked file reading loops (no duplicate read() calls)
→ Regex matching (search once, act on the result)
→ List comprehensions with transform + filter in one pass

Plus: an honest take on when NOT to use it —
dense syntax has a readability cost and it's worth knowing.

Requires Python 3.8+. Works anywhere you write Python today.
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