Why calling print in a Python signal handler can crash your program

Is it safe to call print in a Python signal handler?

Python's signal handling model defers user handlers until the interpreter is safe, but reentrancy can still bite: if a signal arrives mid-print, the handler may call print again, triggering a RuntimeError. This article stress-tests the scenario, explains why it happens, and argues it's a curiosity rather than a practical threat—though it still advises against heavy work in handlers.