bpo-30708: Check for null characters in PyUnicode_AsWideCharString(). by serhiy-storchaka · Pull Request #2285 · python/cpython (original) (raw)

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This exception is for the users of extensions, not for the authors of extensions. PyArg_ParseTuple() raises the same exception, as well as some other functions. Using PyArg_ParseTuple() or PyUnicode_AsWideCharString() or other way for converting Python objects to C values is an implementation detail insignificant for the users of extensions. Words about a size parameter don't make sense at Python level.

The direct users of C API can read the PyUnicode_AsWideCharString() documentation when they get this exception (as well as they can read the PyArg_ParseTuple() documentation when they get the similar exception in PyArg_ParseTuple()). It is explicitly documented.