#16067: Python 3 preparation: The semantic of filter() function is changed
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Reporter: wluebbe | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: distribution | Resolution:
Keywords: python3 | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/wluebbe/ticket/16067 | e574c6856980b83c05e687c4f8a50119972789c0
Dependencies: | Stopgaps:
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Changes (by wluebbe):
* commit: => e574c6856980b83c05e687c4f8a50119972789c0
* branch: => u/wluebbe/ticket/16067
Comment:
{{{2to3}}} does even better as its documentation
[[https://docs.python.org/2.7/library/2to3.html#2to3fixer-filter|2to3
filter]] suggests:[[br]]
"Wraps filter() usage in a list call."
Often it changes the code as indicated by
[[https://docs.python.org/2.7/library/functions.html#filter|filter()]]:
[[br]]
"Note that {{{filter(function, iterable)}}} is equivalent to {{{[item for
item in iterable if function(item)]}}} if function is not {{{None}}} and
{{{[item for item in iterable if item]}}} if function is {{{None}}}."
This is more readable and more pythonic as a combination of {{{filter}}}
and {{{lamda}}}.
And it allows sometimes further improvements!
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New commits:
||[http://git.sagemath.org/sage.git/commit/?id=e574c6856980b83c05e687c4f8a50119972789c0
e574c68]||{{{trac #16067: changes generated by "2to3 -w -f filter
src/sage"}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/16067#comment:2>
Sage <http://www.sagemath.org>
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