typetesting, adaptation, typeclasses, ... (was Re: isinstance() considered harmful)

[Jason Orendorff]

> In MetaPy.Sugar.Sequence, I define everything in terms of
> simple_getitem, simple_setitem, simple_delitem, insert, and __len__.
> [...]
> append is defined in terms of extend [...]

Wouldn't this be better?

  def append(self, obj):
      self.insert(self.__len__(), obj)

## Jason Orendorff    http://www.jorendorff.com/