Bug in string.find; was: Re: Proposed PEP: New style indexing,was Re: Bug in slice type

[Robert Kern]

Bryan Olson wrote:

>      Currently, user-defined classes can implement Python
>      subscripting and slicing without implementing Python's len()
>      function. In our proposal, the '$' symbol stands for the
>      sequence's length, so classes must be able to report their
>      length in order for $ to work within their slices and
>      indexes.
> 
>      Specifically, to support new-style slicing, a class that
>      accepts index or slice arguments to any of:
> 
>          __getitem__
>          __setitem__
>          __delitem__
>          __getslice__
>          __setslice__
>          __delslice__
> 
>      must also consistently implement:
> 
>          __len__
> 
>      Sane programmers already follow this rule.

Incorrect. Some sane programmers have multiple dimensions they need to
index.

  from Numeric import *
  A = array([[0, 1], [2, 3], [4, 5]])
  A[$-1, $-1]

The result of len(A) has nothing to do with the second $.

-- 
Robert Kern
rkern at ucsd.edu

"In the fields of hell where the grass grows high
 Are the graves of dreams allowed to die."
  -- Richard Harter