On Thu, Apr 28, 2016 at 1:52 PM, Ethan Furman <et...@stoneleaf.us> wrote: > > The point Ben was trying to make is this: you should never* call __dunder__ > methods in normal code; there is no need to do so: > > - use len(), not __len__() > - use next(), not __next__() > - use some_instance.an_attribute, not some_instance.__dict__['an_attribute'] > > -- > ~Ethan~ > > * Okay, maybe /almost/ never. About the only time you need to is when > giving your classes special methods, such as __add__ or __repr__.
My rule of thumb is: Dunders are for defining, not for calling. It's not a hard-and-fast rule, but it'll get you through 99%+ of situations. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
