Hey, What has not been mentioned yet is simple delegation.
Often you want to rewrite a method, maybe have different (more or less) parameters and additionally keep the old methods for backwards compatibility. Or mark it as deprecated at a later point. So you could write the new method and change the old method to call the new method but with the parameters the new method expects. If you explain this in the docstrings as well. Then you do not need to actually replace the method. Or you had a completely different use-case in mind, that I missed. Cheers Lars Lars Liedtke Software Entwickler [Tel.] [Fax] +49 721 98993- [E-Mail] l...@solute.de<mailto:l...@solute.de> solute GmbH Zeppelinstraße 15 76185 Karlsruhe Germany [Logo Solute] Marken der solute GmbH | brands of solute GmbH [Marken] [Advertising Partner] Geschäftsführer | Managing Director: Dr. Thilo Gans, Bernd Vermaaten Webseite | www.solute.de <http://www.solute.de/> Sitz | Registered Office: Karlsruhe Registergericht | Register Court: Amtsgericht Mannheim Registernummer | Register No.: HRB 110579 USt-ID | VAT ID: DE234663798 Informationen zum Datenschutz | Information about privacy policy https://www.solute.de/ger/datenschutz/grundsaetze-der-datenverarbeitung.php Am 16.09.22 um 22:55 schrieb Ralf M.: I would like to replace a method of an instance, but don't know how to do it properly. My first naive idea was inst = SomeClass() def new_method(self, param): # do something return whatever inst.method = new_method however that doesn't work: self isn't passed as first parameter to the new inst.method, instead inst.method behaves like a static method. I had a closer look at the decorators classmethod and staticmethod. Unfortunetely I couldn't find a decorator / function "instancemethod" that turns a normal function into an instancemethod. The classmethod documentation contains a reference to the standard type hierarchie, and there is an explanation that an instancemethod is sort of a dynamically created wrapper around a function, which is accessable as __func__. So I modified the last line of the example above to inst.method.__func__ = new_method but got told that __func__ is read only. I found some information about methods in the Descriptor HowTo Guide, but it's about how it works internally and doesn't tell how to solve my problem (at least it doesn't tell me). Now I'm running out of ideas what to try next or what sections of the documentation to read next. Any ideas / pointers? Ralf M. -- https://mail.python.org/mailman/listinfo/python-list
