[Python-Dev] Inplace operations for PyLong objects (original) (raw)
Manciu, Catalin Gabriel catalin.gabriel.manciu at intel.com
Fri Sep 1 16:49:44 EDT 2017
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My question is -- how can the interpreter know if it can alter what is supposed to be an immutable in-place? If it's used only internally to a function, the it would be safe, but how to know that?
-CHB
You can just check the reference count of your object, it's a member of the PyObject structure which every CPython object contains: ob_refcnt. This will indicate if your object is referenced by other Python variables or by Python containers such as lists, tuples, dicts, sets etc.
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