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bpo-32308: Replace empty matches adjacent to a previous non-empty match in re.sub(). (#4846)

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Serhiy Storchaka 2018-01-04 11:06:13 +02:00 • committed by GitHub
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Doc/whatsnew/3.7.rst
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@ -881,8 +881,9 @@ Changes in the Python API
* The result of splitting a string on a :mod:`regular expression <re>`
that could match an empty string has been changed. For example
splitting on ``r'\s*'`` will now split not only on whitespaces as it
did previously, but also between any pair of non-whitespace
characters. The previous behavior can be restored by changing the pattern
did previously, but also on empty strings before all non-whitespace
characters and just before the end of the string.
The previous behavior can be restored by changing the pattern
to ``r'\s+'``. A :exc:`FutureWarning` was emitted for such patterns since
Python 3.5.
@ -893,7 +894,13 @@ Changes in the Python API
positions 2--3. To match only blank lines, the pattern should be rewritten
as ``r'(?m)^[^\S\n]*$'``.
(Contributed by Serhiy Storchaka in :issue:`25054`.)
:func:`re.sub()` now replaces empty matches adjacent to a previous
non-empty match. For example ``re.sub('x*', '-', 'abxd')`` returns now
``'-a-b--d-'`` instead of ``'-a-b--d-'`` (the first minus between 'b' and
'd' replaces 'x', and the second minus replaces an empty string between
'x' and 'd').
(Contributed by Serhiy Storchaka in :issue:`25054` and :issue:`32308`.)
* :class:`tracemalloc.Traceback` frames are now sorted from oldest to most
recent to be more consistent with :mod:`traceback`.