diff options
Diffstat (limited to 'Doc/whatsnew/3.7.rst')
| -rw-r--r-- | Doc/whatsnew/3.7.rst | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst index 1924881..1311e9e 100644 --- a/Doc/whatsnew/3.7.rst +++ b/Doc/whatsnew/3.7.rst @@ -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`. |