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gh-129858: Special syntax error forelif
block afterelse
#129902
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Previously, having an elif block after an else block would raise a standard syntax error.
@pablogsal I see that you've been tagged for review. Please see the associated issue for discussion about whether an even more sophisticated error message is possible. |
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Please add a test. There should be tests in some |
@picnixz No problem--will do. |
I've implemented a test as requested, though I'll hold off on committing or pushing it until we decide on the exact wording of the error message. |
ghost commentedFeb 11, 2025 • edited by ghost
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edited by ghost
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Those last two commits should appear as being from this GitHub account. Let me see if I can delete them and try again. |
In general, we avoid force-pushing, but you can do it in this case and amend the commit author and put the correct email address. (Not sure if it could help in this though) |
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to883ada9
CompareThe force push seems to have fixed the problem without any issues. The usernames for my work and personal email differ by one letter, which is occasionally inconvenient. |
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We can draw inspiration fromhere, I suppose? |
What about this? I'm not sure if the blocks need something more realistic than
>>>ifword.startswith('a'):...pass...else:...pass...elifword.startswith('b'):...passFile"<stdin>",line5elifword.startswith('b'):^^^^SyntaxError:'elif'blockfollowsan'else'block |
Yes that's what I had in mind. |
picnixz commentedFeb 12, 2025 • edited
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Another possibility is: >>>ifwho=="me":...print("This is me!")...else:...print("This is not me!")...elifwhoisNone:...print("Who is it?")File"<stdin>",line5elifwhoisNone:^^^^SyntaxError:'elif'blockfollowsan'else'block |
I like that, but I think I'll do "It's me!" and "It's not me!" in honor of Elphaba, |
Let's go for this one :) |
We also get a subtle homage toBritney :) |
Misc/NEWS.d/next/Core_and_Builtins/2025-02-12-01-36-13.gh-issue-129858.M-f7Gb.rst OutdatedShow resolvedHide resolved
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I've updated the PR frommain
which will fix the unrelated "computed changes" error.
Misc/NEWS.d/next/Core_and_Builtins/2025-02-12-01-36-13.gh-issue-129858.M-f7Gb.rst OutdatedShow resolvedHide resolved
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…e-129858.M-f7Gb.rstCo-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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Some markup nits and LGTM
Doc/whatsnew/3.14.rst Outdated
@@ -174,6 +174,22 @@ Improved error messages | |||
^^^^^^^ | |||
ValueError: too many values to unpack (expected 3, got 4) | |||
* ``elif`` statements that follow an ``else`` block now have a specific error message. |
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*:keyword:`elif` statements that follow an:keyword:`else` block now have a specific error message.
@@ -0,0 +1 @@ | |||
``elif`` statements that follow an ``else`` block now have a specific error message. |
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:keyword:`elif` statements that follow an:keyword:`else` block now have a specific error message.
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You can also put the keyword syntax here.
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@picnixz done! |
Yes, that's why contributors don't need to force-push unless they know what they're doing and/or it's a draft PR. Force-pushing rewrites the history and makes reviews harder if we want to compare with a previous commit (and that's the main reason why we don't want force pushes). I personally do force-push when I have no PR open or if it's a draft or if I need to amend a commit due to git issues (like you had). |
I see that there are now merge conflicts with |
You can just regenerate the parser files indeed (I think they are automatically generated right?) |
@picnixz yeah, there's a make command to do it. |
Just merge the grammar from main, and regenerate the Parser/parser.c file then. When there are conflicts in auto-generated files, just regenerating them is fine. |
python-cla-botbot commentedApr 18, 2025 • edited
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Please can you fix the merge conflict? Note the 3.14 feature freeze is in just under three weeks:https://peps.python.org/pep-0745/ |
… not implement changes from this PR.
Please check the CI failures. |
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LGTM! Fantastic job@swfarnsworth! Thanks for your contribution :) |
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Previously, having an elif block after an else block would raise a standard syntax error. This PR implements a special syntax error saying "elif not allowed after else".
I compiled cpython with this version of the parser and confirmed that it doesn't conflict with other special syntax or indentation errors.
elif
afterelse
#129858