Four Python One-Liners That Silently Produce Wrong Results

A developer ran twelve tricky Python snippets on version 3.12 and recorded the outputs. Four of them behave in ways that are easy to misread, such as a string like "False" evaluating as truthy and a mutable default argument persisting across function calls. Several of the traps fail quietly rather than raising errors, which makes the resulting wrong numbers harder to notice. The author also points out that Python's rounding of .5 ties to the nearest even number and that infinity minus infinity yields nan. The behaviors are all documented, and the author argues that the real issue is developers not reading the documentation.