Einstein summation notation

[Matthew Barnett]

Steven D'Aprano wrote:
> On Fri, 17 Jul 2009 16:09:03 +0100, MRAB wrote:
> 
>> Python did always have True and False.

Oops! I meant "didn't", of course.
> 
> $ python1.5
> Python 1.5.2 (#1, Apr  1 2009, 22:55:54)  [GCC 4.1.2 20070925 (Red Hat 
> 4.1.2-27)] on linux2
> Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>>> True, False
> Traceback (innermost last):
>   File "<stdin>", line 1, in ?
> NameError: True
>