I found following inconsistency in the error message when there's a missing comma (it behaves that way both on main and 3.10). Here's what happens with numbers, as expected: Python 3.11.0a1+ (heads/main:32f55d1a5d, Nov 5 2021, 13:18:52) [GCC 11.2.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> 1 2 3 4 File "<stdin>", line 1 1 2 3 4 ^^^ SyntaxError: invalid syntax. Perhaps you forgot a comma? But with names the error is further right in the lines: >>> a b c d File "<stdin>", line 1 a b c d ^^^ SyntaxError: invalid syntax. Perhaps you forgot a comma? >>> a b c d e f g File "<stdin>", line 1 a b c d e f g ^^^ SyntaxError: invalid syntax. Perhaps you forgot a comma? That looks potentially quite confusing to me? (I don't know if these nit-picky parsing issues are too annoying, if they are please tell me to stop filing them).

>(I don't know if these nit-picky parsing issues are too annoying, if they are please tell me to stop filing them). Don't worry, I think is great to discuss these cases. If there are too many, then maybe it will take a while to correct, but please, don't stop :) > That looks potentially quite confusing to me? I agree is unfortunate that is inconsistent, but unfortunately, this is going to be a bit of a pain because the way the expression rule is reached. I will try to see if we can easily fix this without having to restructure a bunch of the grammar

 New changeset 546cefcda75d7150b55c8bc1724bea35a1e12890 by Pablo Galindo Salgado in branch 'main': bpo-45727: Make the syntax error for missing comma more consistent (GH-29427) https://github.com/python/cpython/commit/546cefcda75d7150b55c8bc1724bea35a1e12890 

 New changeset 511ee1c0fa4dedf32cc2b9f9fa13aa61e07bd165 by Pablo Galindo Salgado in branch '3.10': [3.10] bpo-45727: Make the syntax error for missing comma more consistent (GH-29427) (GH-29647) https://github.com/python/cpython/commit/511ee1c0fa4dedf32cc2b9f9fa13aa61e07bd165 

 New changeset 24c10d2943c482c4d3ecc71d45df2d8c10fa5bb1 by Pablo Galindo Salgado in branch 'main': bpo-45727: Only trigger the 'did you forgot a comma' error suggestion if inside parentheses (GH-29757) https://github.com/python/cpython/commit/24c10d2943c482c4d3ecc71d45df2d8c10fa5bb1 

 New changeset c72311d91787005713bb5daf4532a86e06496afd by Pablo Galindo Salgado in branch '3.10': [3.10] bpo-45727: Only trigger the 'did you forgot a comma' error suggestion if inside parentheses. (GH-29767) https://github.com/python/cpython/commit/c72311d91787005713bb5daf4532a86e06496afd