Three Minor Feature Requests for 2.2

[Paul Prescod]

Raymond Hettinger wrote:
> 
> 1. Add an optional argument to reduce() to control whether the results are
> accumulated left to right or right to left.

Why not use the reverse method? 

> 2.  Amend the syntax for class definitions to optionally accept an empty
> argument
> list for superclasses.  This comes up when adding and then later removing
> mix-ins.
> 
>     class C():              # should work as well as class C:

I've wanted this for years but the argument in favor is so weak that I
don't think Guido would go for it. "I'm too lazy to remove the useless
parens."

> 3.  Alter extend() to accept multiple sequence arguments:
> 
>     a = [1,2,3]
>     a.extend( [4,5,6], [7,8,9] )

map(a.extend, [list1, list2])


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