On Tue, Nov 17, 2020 at 08:49:28AM +0100, Marco Sulla wrote: > PS: pattern matching, for a mere mortal like me, seems to be something very > exotical.
Have you ever written code that looks like this? if isinstance(obj, tuple) and len(obj) ==3: x, y, z = obj elif isinstance(obj, tuple) and len(obj) == 2: x, y = obj z = 0.0 elif isinstance(obj, float): x = obj y = z = 0.0 else: raise ValueError process(x, y, z) That's pattern matching. match obj: case x, y, z: pass case x, y: z = 0.0 case x if isinstance(x, float): y = z = 0.0 case _: raise ValueError process(x, y, z) There may be cleaner or alternative ways to write this as a match statement, I'm still learning pattern matching idioms myself. But in a nutshell, they simplify what would otherwise look like a long, repetitive chain of if, isinstance, sequence unpacking, etc. -- Steve _______________________________________________ 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/SVWBK5PJISLMPEZ7CHM2HVLGFTGQJKIZ/ Code of Conduct: http://python.org/psf/codeofconduct/