A SyntaxError less detailed since 3.10 in specific example

Python 3.10.5

New SyntaxError ^ pointer is misleading in following example compared to older python versions.

d = {
    "foo":"foo",
    "bar":lambda b:{"bar":testfn(von="1"b=b)}, 
    }

Results in error message on 3.10.5:

File "test.py", line 3
  "bar":lambda b:{"bar":testfn(von="1"b=b)},
       ^
SyntaxError: expression expected after dictionary key and ':'

While on python 3.8 it was more helpful:

File "test.py", line 3
  "bar":lambda b:{"bar":testfn(von="1"b=b)},
                                      ^
SyntaxError: invalid syntax

edit: added triple backquotes to preserve formatting on github. thanks hauntsaninja.
On 3.10.5 it is pointing on the ":" prior to lambda, while on 3.8 it is pointing on the missing comma.

You can use triple backquotes (```) to preserve formatting on Github.

λ python3.9
Python 3.9.12 (main, Apr 16 2022, 17:49:09) 
[Clang 13.0.0 (clang-1300.0.27.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> d = { "foo":"foo", "bar":lambda b:{"bar":testfn(von="1"b=b)}, }
  File "<stdin>", line 1
    d = { "foo":"foo", "bar":lambda b:{"bar":testfn(von="1"b=b)}, }
                                                           ^
SyntaxError: invalid syntax

λ python3.10
Python 3.10.5 (main, Jun 18 2022, 23:46:13) [Clang 13.0.0 (clang-1300.0.27.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> d = { "foo":"foo", "bar":lambda b:{"bar":testfn(von="1"b=b)}, }
  File "<stdin>", line 1
    d = { "foo":"foo", "bar":lambda b:{"bar":testfn(von="1"b=b)}, }
                            ^
SyntaxError: expression expected after dictionary key and ':'

@pablogsal

cc @pablogsal

I think i've found a simple fix that seems to work, will open a PR.

gh-94192: Fix error for dictionary literals with invalid expression a…

pythongh-94192: Fix error for dictionary literals with invalid expres…

gh-94192: Fix error for dictionary literals with invalid expression a…

[3.10] gh-94192: Fix error for dictionary literals with invalid expre…

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A SyntaxError less detailed since 3.10 in specific example #94192

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A SyntaxError less detailed since 3.10 in specific example #94192

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hauntsaninja commented on Jun 24, 2022

iritkatriel commented on Jun 26, 2022

wookie184 commented on Jun 26, 2022

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