There are two copies of the grammar -- the one used by Python itself as
Grammar/Grammar, and the one used by lib2to3 which has necessarily diverged at
Lib/lib2to3/Grammar.txt because it needs to support older syntax an we want it
to be reasonable stable to avoid requiring fixer rewrites.
This brings suport for syntax like `if x:= foo():` to match what the live
Python grammar does.
This should've been added at the time of the walrus operator itself, but lib2to3 being
independent is often overlooked. So we do consider this a bugfix rather than enhancement.
(cherry picked from commit 3c3aa4516c)
Co-authored-by: Tim Hatch <tim@timhatch.com>
These are valid even in python 2.7
https://bugs.python.org/issue33348
Automerge-Triggered-By: @gpshead
(cherry picked from commit 96b06aefe2)
Co-authored-by: Zsolt Dollenstein <zsol.zsol@gmail.com>
New tests also added.
I also made the comments in line with the builtin Grammar/Grammar. PEP 306 was
withdrawn, Kees Blom's railroad program has been lost to the sands of time for
at least 16 years now (I found a python-dev post from people looking for it).
svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3
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r83852 | benjamin.peterson | 2010-08-08 15:45:44 -0500 (Sun, 08 Aug 2010) | 1 line
wrap with parens
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r83853 | benjamin.peterson | 2010-08-08 15:46:31 -0500 (Sun, 08 Aug 2010) | 1 line
use parens
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r83857 | benjamin.peterson | 2010-08-08 15:59:49 -0500 (Sun, 08 Aug 2010) | 1 line
things which use touch_import should be pre order
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r84042 | george.boutsioukis | 2010-08-14 16:10:19 -0500 (Sat, 14 Aug 2010) | 2 lines
This revision incorporates into the 2to3 tool the new, faster, tree matching algorithm developed during a GSOC project. The algorithm resides in the two added modules, btm_matcher and btm_utils. New code has been added to drive the new matching process in refactor.py and a few minor changes were made in other modules. A BM_compatible flag(False by default) has been added in fixer_base and it is set to True in most of the current fixers.
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r84216 | benjamin.peterson | 2010-08-19 16:44:05 -0500 (Thu, 19 Aug 2010) | 1 line
allow star_expr in testlist_gexp
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r84274 | benjamin.peterson | 2010-08-22 18:40:46 -0500 (Sun, 22 Aug 2010) | 1 line
wrap long line
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r84275 | benjamin.peterson | 2010-08-22 18:42:22 -0500 (Sun, 22 Aug 2010) | 1 line
cleanup
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r84276 | benjamin.peterson | 2010-08-22 18:51:01 -0500 (Sun, 22 Aug 2010) | 1 line
when there's a None value and a traceback, don't call type with it #9661
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r84375 | george.boutsioukis | 2010-08-31 08:38:53 -0500 (Tue, 31 Aug 2010) | 3 lines
Idiomatic code changes & stylistic issues fixed in the BottomMatcher module. Thanks to Benjamin Peterson for taking the time to review the code.
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r85388 | benjamin.peterson | 2010-10-12 17:27:44 -0500 (Tue, 12 Oct 2010) | 1 line
fix urllib fixer with multiple as imports on a line #10069
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r85478 | benjamin.peterson | 2010-10-14 08:09:56 -0500 (Thu, 14 Oct 2010) | 1 line
stop abusing docstrings
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r85506 | benjamin.peterson | 2010-10-14 17:45:19 -0500 (Thu, 14 Oct 2010) | 1 line
kill sibling import
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r85507 | benjamin.peterson | 2010-10-14 17:54:15 -0500 (Thu, 14 Oct 2010) | 1 line
remove trailing whitespace
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r85508 | benjamin.peterson | 2010-10-14 17:55:28 -0500 (Thu, 14 Oct 2010) | 1 line
typo
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svn+ssh://pythondev@svn.python.org/python/trunk
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r76062 | benjamin.peterson | 2009-11-02 12:12:12 -0600 (Mon, 02 Nov 2009) | 70 lines
Merged revisions 74359,75081,75088,75213,75278,75303,75427-75428,75734-75736,75865,76059-76061 via svnmerge from
svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3
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r74359 | benjamin.peterson | 2009-08-12 17:23:13 -0500 (Wed, 12 Aug 2009) | 1 line
don't pass the deprecated print_function option
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r75081 | benjamin.peterson | 2009-09-26 22:02:57 -0500 (Sat, 26 Sep 2009) | 1 line
let 2to3 work with extended iterable unpacking
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r75088 | benjamin.peterson | 2009-09-27 11:25:21 -0500 (Sun, 27 Sep 2009) | 1 line
look on the type only for __call__
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r75213 | benjamin.peterson | 2009-10-03 10:09:46 -0500 (Sat, 03 Oct 2009) | 5 lines
revert 75212; it's not correct
People can use isinstance(x, collections.Callable) if they expect objects with
__call__ in their instance dictionaries.
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r75278 | benjamin.peterson | 2009-10-07 16:25:56 -0500 (Wed, 07 Oct 2009) | 4 lines
fix whitespace problems with fix_idioms #3563
Patch by Joe Amenta.
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r75303 | benjamin.peterson | 2009-10-09 16:59:11 -0500 (Fri, 09 Oct 2009) | 1 line
port latin-1 and utf-8 cookie improvements
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r75427 | benjamin.peterson | 2009-10-14 20:35:57 -0500 (Wed, 14 Oct 2009) | 1 line
force floor division
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r75428 | benjamin.peterson | 2009-10-14 20:39:21 -0500 (Wed, 14 Oct 2009) | 1 line
silence -3 warnings about __hash__
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r75734 | benjamin.peterson | 2009-10-26 16:25:53 -0500 (Mon, 26 Oct 2009) | 2 lines
warn on map(None, ...) with more than 2 arguments #7203
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r75735 | benjamin.peterson | 2009-10-26 16:28:25 -0500 (Mon, 26 Oct 2009) | 1 line
remove unused result
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r75736 | benjamin.peterson | 2009-10-26 16:29:02 -0500 (Mon, 26 Oct 2009) | 1 line
using get() here is a bit pointless
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r75865 | benjamin.peterson | 2009-10-27 15:49:00 -0500 (Tue, 27 Oct 2009) | 1 line
explain reason for warning
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r76059 | benjamin.peterson | 2009-11-02 11:43:47 -0600 (Mon, 02 Nov 2009) | 1 line
tuples are no longer used for children
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r76060 | benjamin.peterson | 2009-11-02 11:55:40 -0600 (Mon, 02 Nov 2009) | 1 line
revert r76059; apparently some fixers rely on Leaf no () for children
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r76061 | benjamin.peterson | 2009-11-02 12:06:17 -0600 (Mon, 02 Nov 2009) | 1 line
make fix_tuple_params keep the tree valid #7253
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svn+ssh://pythondev@svn.python.org/python/trunk
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r66453 | benjamin.peterson | 2008-09-13 12:43:19 -0500 (Sat, 13 Sep 2008) | 24 lines
Merged revisions 66191,66418,66438,66445 via svnmerge from
svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3
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r66191 | benjamin.peterson | 2008-09-03 17:00:52 -0500 (Wed, 03 Sep 2008) | 1 line
update the Grammar file after recent syntax changes
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r66418 | benjamin.peterson | 2008-09-12 18:49:48 -0500 (Fri, 12 Sep 2008) | 1 line
a trival fix to get a few more print corner cases #2899
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r66438 | benjamin.peterson | 2008-09-12 21:32:30 -0500 (Fri, 12 Sep 2008) | 5 lines
add Jack Diederich's fixer for metaclass syntax #2366
my contribution to this was adding a few tests and fixing a few bugs
I also reviewed it (Jack is a committer)
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r66445 | benjamin.peterson | 2008-09-13 10:50:00 -0500 (Sat, 13 Sep 2008) | 1 line
add a few more tests concerning int literals and weird spacing
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