[ python-Bugs-1441408 ] svn head compiler fails to spot extended slicing

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Bugs item #1441408, was opened at 2006-03-02 11:20
Message generated for change (Comment added) made by ncoghlan
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Category: Parser/Compiler
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Michael Hudson (mwh)
Assigned to: Nobody/Anonymous (nobody)
Summary: svn head compiler fails to spot extended slicing

Initial Comment:
This is Python SVN HEAD:

>>> dis.dis(compile("x[::]", '', 'single'))
  1           0 LOAD_NAME                0 (x)
              3 SLICE+0             
              4 PRINT_EXPR          
              5 LOAD_CONST               0 (None)
              8 RETURN_VALUE        

This is Python 2.4:

>>> dis.dis(compile("x[::]", '', 'single'))
  1           0 LOAD_NAME                0 (x)
              3 LOAD_CONST               0 (None)
              6 LOAD_CONST               0 (None)
              9 LOAD_CONST               0 (None)
             12 BUILD_SLICE              3
             15 BINARY_SUBSCR       
             16 PRINT_EXPR          
             17 LOAD_CONST               0 (None)
             20 RETURN_VALUE        


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>Comment By: Nick Coghlan (ncoghlan)
Date: 2006-03-18 04:04

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Applied 1452332 to SVN (generates an explicit None reference
for the step when the second colon is present but no
expressions is supplied for the step)

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Comment By: Nick Coghlan (ncoghlan)
Date: 2006-03-17 23:45

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Alternate patch that doesn't modify the AST posted as 1452332

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Comment By: Grant Olson (logistix)
Date: 2006-03-10 10:22

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Patch 1446847 Posted.

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Comment By: Grant Olson (logistix)
Date: 2006-03-06 09:33

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This only happens when you have implicit slice values. 
x[1:2:3] works fine.  I'm finishing up a patch and will post
to sf shortly.


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