New submission from Shantanu <hauntsani...@gmail.com>:
With Python 3.8:
```
Python 3.8.1 (default, Jan 23 2020, 23:36:06)
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ast
>>> ast.parse("(a).x").body[0].value.col_offset
1
```
With Python 3.9:
```
Python 3.9.0a5+ (heads/master:799d7d6, Apr 6 2020, 16:05:37)
[Clang 11.0.0 (clang-1100.0.33.17)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import ast
>>> ast.parse("(a).x").body[0].value.col_offset
0
```
Maybe related to the new parser? I couldn't find what the environment variable
to turn it off was.
For context, I'm trying to get mypy tests to pass with 3.9, but the tests make
use of specific col_offsets for error reporting. It would be nice if these
continued to match with 3.9
----------
messages: 366909
nosy: hauntsaninja
priority: normal
severity: normal
status: open
title: Python3.9 changes col_offset for some ast nodes
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40349>
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