#16073: Python 3 preparation: The semantic of map() function is changed
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Reporter: | Owner:
wluebbe | Status: needs_review
Type: | Milestone: sage-6.4
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
distribution | Work issues:
Keywords: | Commit:
python3 | f47ac2b0aeef8cd6172206c1f6ef36c326dafdc9
Authors: | Stopgaps:
Wilfried Luebbe |
Report Upstream: N/A |
Branch: |
public/16073 |
Dependencies: |
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Comment (by wluebbe):
I uploaded a new branch {{{u/wluebbe/ticket/16073-2}}}.
My goal is to replace all {{{map}}} calls with list comprehension or
generator expressions. Currently there are still about 40
{{{list(map(...}}} in the code (somehow my regexp did not find them :-/ )
and a number of {{{map}}}s in the doctests. So there is still some work to
do.
The drawback of wrapping {{{map}}} with {{{list}}} is that in Python2 this
is redundant.
If a context accepts iterators then in Python2 {{{map}}} cannot exploit
this (as it returns a list). Remapping {{{map}}} in Python2 on its
iterator version {{{itertools.imap}}} requires extra code.
The current branch does change list comprehensions to generator
expressions in all possible cases. I would rather leave this refactoring
to a new ticket since there are lots of applicable cases separate from
16073.
I am very much interested in feedback to {{{u/wluebbe/ticket/16073-2}}}.
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Ticket URL: <http://trac.sagemath.org/ticket/16073#comment:25>
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