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gh-93883: elide traceback indicators when possible (#93994)

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* gh-93883: elide traceback indicators when possible

Elide traceback column indicators when the entire line of the
frame is implicated.  This reduces traceback length and draws
even more attention to the remaining (very relevant) indicators.

Example:
```
Traceback (most recent call last):
  File "query.py", line 99, in <module>
    bar()
  File "query.py", line 66, in bar
    foo()
  File "query.py", line 37, in foo
    magic_arithmetic('foo')
  File "query.py", line 18, in magic_arithmetic
    return add_counts(x) / 25
           ^^^^^^^^^^^^^
  File "query.py", line 24, in add_counts
    return 25 + query_user(user1) + query_user(user2)
                ^^^^^^^^^^^^^^^^^
  File "query.py", line 32, in query_user
    return 1 + query_count(db, response['a']['b']['c']['user'], retry=True)
                               ~~~~~~~~~~~~~~~~~~^^^^^
TypeError: 'NoneType' object is not subscriptable
```

Rather than going out of our way to provide indicator coverage
in every traceback test suite, the indicator test suite should
be responible for sufficient coverage (e.g. by adding a basic
exception group test to ensure that margin strings are covered).
This commit is contained in:
John Belmonte 2022-07-11 15:40:53 +09:00 • committed by GitHub
parent c9118afd04
commit da717519ec
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9 changed files with 111 additions and 135 deletions
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Doc/whatsnew/3.11.rst
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@ -117,7 +117,6 @@ when dealing with deeply nested dictionary objects and multiple function calls,
Traceback (most recent call last):
File "query.py", line 37, in <module>
magic_arithmetic('foo')
^^^^^^^^^^^^^^^^^^^^^^^
File "query.py", line 18, in magic_arithmetic
return add_counts(x) / 25
^^^^^^^^^^^^^