Raymond Ops
Apr 25, 2025 · Fundamentals
Understanding Python’s `is` Operator, re.sub quirks, and list pitfalls
This article explains why Python’s `is` operator yields True or False for integers, how integer caching and code‑block scope affect object identity, uncovers a subtle misuse of re.sub’s count parameter, clarifies lstrip’s character‑wise stripping, and demonstrates the pitfalls of creating nested lists with the `[*] * n` syntax.
Pythonlist-issuesobject-identity
0 likes · 7 min read