[Patches] [ python-Patches-473985 ] str, __getitem__ and slices

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Patches item #473985, was opened at 2001-10-23 03:39
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=305470&aid=473985&group_id=5470

Category: Core (C code)
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Walter Dörwald (doerwalter)
Assigned to: Nobody/Anonymous (nobody)
Summary: str, __getitem__ and slices

Initial Comment:
Using slices with __getitem__ doesn't work with 
classes derived from str:
---
class S(str):
   def __getitem__(self, index):
      print "getitem", index
      return str.__getitem__(self, index)
   def __setitem__(self, index, value):
      print "setitem", index, value

s = S("foo")
print s[0]
print s[0:2]
s[0] = "b"
s[0:2] = "bar"
---
This prints:
---
getitem 0
f
fo
setitem 0 b
setitem slice(0, 2, None) bar
---
instead of
---
getitem 0
f
getitem slice(0, 2, None)
fo
setitem 0 b
setitem slice(0, 2, None) bar
---
i.e. when no __getslice__ is defined s[0:2] will not 
be forwarded to __getitem__, but it seems to work for 
__setitem__.

----------------------------------------------------------------------

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