On 24/03/20 3:43 pm, Dennis Sweeney wrote:
This was an attempt to ensure no one can do funny business with tuple or str subclassing. I was trying to emulate the ``PyTuple_Check`` followed by ``PyTuple_GET_SIZE`` and ``PyTuple_GET_ITEM`` that are done by the C implementation of ``str.startswith()``
The C code uses those functions for efficiency, not to prevent "funny business". PyTuple_GET_SIZE and PyTuple_GET_ITEM are macros that directly access fields of the tuple struct, and PyTuple_Check is much faster than a full isinstance check. There is no point in trying to emulate these in Python code. -- Greg _______________________________________________ Python-Dev mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/[email protected]/message/X3OBCBM3XTZD7XFEQ2ULR6XGEXB6PRLZ/ Code of Conduct: http://python.org/psf/codeofconduct/