Allow `range(start, None, step)` for an endless range

Ideas
7

I really like your proposal.
I know about itertools.count, but find it confusing and quite cumbersome to import just for that.
I don’t think there are any real disadvantages:

  • performance. Very unlikely to be significant
  • implementation of len. Just a NotImplemented exception could be raised
  • duplicate functionality There are so many cases of that in Python, that it can’t be a serious problem. Please don’t deprecate itertools.count