[issue20606] Operator Documentation Example doesn't work

2015-01-04 Thread Gareth Rees 

Gareth Rees added the comment:

This is a duplicate of #22180, which was fixed in changeset 9c250f34bfa3 by 
Raymond Hettinger in branch '3.4'. The fix just removes the bad example, as in 
my patch. So I suggest that this issue be closed as a duplicate.

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[issue20606] Operator Documentation Example doesn't work

2015-01-04 Thread Andrew Svetlov 

Andrew Svetlov added the comment:

Closed

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nosy: +asvetlov
resolution:  - duplicate
stage:  - resolved
superseder:  - operator.setitem example no longer works in Python 3 due to 
lazy map

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[issue20606] Operator Documentation Example doesn't work

2015-01-04 Thread Benjamin Peterson 

Changes by Benjamin Peterson benja...@python.org:


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status: open - closed

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[issue20606] Operator Documentation Example doesn't work

2014-02-15 Thread Ezio Melotti 

Changes by Ezio Melotti ezio.melo...@gmail.com:


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[issue20606] Operator Documentation Example doesn't work

2014-02-12 Thread silentbat 

New submission from silentbat:

In the Docs for Python3.3
http://docs.python.org/3.3/library/operator.html#operator.__setitem__

the following example doesn't work.

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assignee: docs@python
components: Documentation
messages: 211079
nosy: docs@python, silent.bat
priority: normal
severity: normal
status: open
title: Operator Documentation Example doesn't work
type: behavior
versions: Python 3.3

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[issue20606] Operator Documentation Example doesn't work

2014-02-12 Thread Gareth Rees 

Gareth Rees added the comment:

The failing example is:

d = {}
keys = range(256)
vals = map(chr, keys)
map(operator.setitem, [d]*len(keys), keys, vals)   

which works in Python 2 where map returns a list, but not in Python 3 where map 
returns an iterator.

Doc/library/operator.rst follows the example with this note:

.. XXX: find a better, readable, example

Additional problems with the example:

1. It's poorly motivated because a dictionary comprehension would be simpler 
and shorter:

d = {i: chr(i) for i in range(256)}

2. It's also unclear why you'd need this dictionary when you could just call 
the function chr (but I suppose some interface might require a dictionary 
rather than a function).

3. To force the map to be evaluated, you need to write list(map(...)) which 
allocates an unnecessary list object and then throws it away. To avoid the 
unnecessary allocation you could use the consume recipe from the itertools 
documentation and write collections.deque(map(...), maxlen=0) but this is 
surely too obscure to use as an example.

I had a look through the Python sources, and made an Ohloh Code search for 
operator.setitem and I didn't find any good examples of its use, so I think 
the best thing to do is just to delete the example.

http://code.ohloh.net/search?s=%22operator.setitem%22pp=0fl=Pythonmp=1ml=1me=1md=1ff=1filterChecked=true

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[issue20606] Operator Documentation Example doesn't work

2014-02-12 Thread Gareth Rees 

Changes by Gareth Rees g...@garethrees.org:


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keywords: +patch
Added file: http://bugs.python.org/file34059/operator.patch

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