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Why Calling print() Inside a Python Signal Handler Can Be Unsafe

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A technical article explores the safety risks of calling Python's print() function within a signal handler. Signal handlers in Python can interrupt the main thread at unpredictable points, potentially causing issues if print() is called mid-execution. The concern centers on re-entrancy, where interrupting certain operations and calling the same or related functions again can lead to deadlocks or corrupted output. The article, published in August 2026 on iafisher.com, has sparked discussion on Hacker News with 10 comments and 28 upvotes.

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Why Calling print() Inside a Python Signal Handler Can Be Unsafe · ShortSingh