On Tue, Nov 5, 2019 at 5:43 PM dieter <die...@handshake.de> wrote: > I suppose that "isinstance" (at least under Python 2) does not > behave exactly as stated in PEP 3119. Instead, "isinstance" > first directly checks for the instance to be an instance of the > class *AND ONLY IF THIS FAILS* calls the class' "__instancecheck__".
PEP 3119 is specifically about Python 3.0; I don't know how much, if any, was backported into Python 2. I strongly recommend using Python 3 when probing features like this. Not everything is supported on the legacy branch of Python. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
