Format StmtAugAssign

[konstin]

Summary

Format statements such as tree_depth += 1. This is a statement that does not allow any line breaks, the only thing to be mindful of is to parenthesize the assigned expression

Jaccard index on django: 0.915 -> 0.918

Test Plan

black tests, and two new tests, a basic one and one that ensures that the child gets parentheses. I ran the django stability check.

[github-actions]

PR Check Results

Ecosystem

✅ ecosystem check detected no changes.

Benchmark

Linux

group                                      main                                   pr
-----                                      ----                                   --
formatter/large/dataset.py                 1.00      8.0±0.03ms     5.1 MB/sec    1.00      8.0±0.03ms     5.1 MB/sec
formatter/numpy/ctypeslib.py               1.00   1764.7±1.85µs     9.4 MB/sec    1.01   1787.4±2.63µs     9.3 MB/sec
formatter/numpy/globals.py                 1.00    197.3±0.26µs    15.0 MB/sec    1.01    199.3±0.44µs    14.8 MB/sec
formatter/pydantic/types.py                1.01      3.9±0.02ms     6.6 MB/sec    1.00      3.8±0.01ms     6.6 MB/sec
linter/all-rules/large/dataset.py          1.01     13.6±0.05ms     3.0 MB/sec    1.00     13.4±0.05ms     3.0 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.01      3.4±0.00ms     4.9 MB/sec    1.00      3.4±0.01ms     4.9 MB/sec
linter/all-rules/numpy/globals.py          1.01    435.1±1.50µs     6.8 MB/sec    1.00    431.3±0.62µs     6.8 MB/sec
linter/all-rules/pydantic/types.py         1.01      6.0±0.01ms     4.3 MB/sec    1.00      5.9±0.01ms     4.3 MB/sec
linter/default-rules/large/dataset.py      1.02      6.8±0.02ms     6.0 MB/sec    1.00      6.7±0.01ms     6.1 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.02   1491.7±3.41µs    11.2 MB/sec    1.00   1467.0±4.99µs    11.4 MB/sec
linter/default-rules/numpy/globals.py      1.02    171.1±0.37µs    17.2 MB/sec    1.00    167.3±1.05µs    17.6 MB/sec
linter/default-rules/pydantic/types.py     1.02      3.1±0.01ms     8.3 MB/sec    1.00      3.0±0.01ms     8.4 MB/sec

Windows

group                                      main                                   pr
-----                                      ----                                   --
formatter/large/dataset.py                 1.07     13.0±0.49ms     3.1 MB/sec    1.00     12.1±0.43ms     3.4 MB/sec
formatter/numpy/ctypeslib.py               1.04      2.8±0.11ms     6.0 MB/sec    1.00      2.6±0.11ms     6.3 MB/sec
formatter/numpy/globals.py                 1.03   313.9±17.62µs     9.4 MB/sec    1.00   305.9±13.28µs     9.6 MB/sec
formatter/pydantic/types.py                1.04      6.1±0.20ms     4.2 MB/sec    1.00      5.9±0.22ms     4.3 MB/sec
linter/all-rules/large/dataset.py          1.01     20.6±0.53ms  2019.6 KB/sec    1.00     20.4±0.72ms  2045.8 KB/sec
linter/all-rules/numpy/ctypeslib.py        1.01      5.4±0.21ms     3.1 MB/sec    1.00      5.4±0.25ms     3.1 MB/sec
linter/all-rules/numpy/globals.py          1.05   672.9±32.90µs     4.4 MB/sec    1.00   638.9±23.61µs     4.6 MB/sec
linter/all-rules/pydantic/types.py         1.05      9.4±0.38ms     2.7 MB/sec    1.00      9.0±0.34ms     2.8 MB/sec
linter/default-rules/large/dataset.py      1.04     11.0±0.31ms     3.7 MB/sec    1.00     10.5±0.34ms     3.9 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.06      2.4±0.11ms     7.1 MB/sec    1.00      2.2±0.09ms     7.5 MB/sec
linter/default-rules/numpy/globals.py      1.00   277.8±13.63µs    10.6 MB/sec    1.00   277.1±33.51µs    10.6 MB/sec
linter/default-rules/pydantic/types.py     1.02      4.8±0.20ms     5.3 MB/sec    1.00      4.7±0.17ms     5.5 MB/sec

[MichaReiser]

Nice!

Please update #4798 or create an issue an link it to the PR so that we keep track of the (at least partially) implemented syntax.

[MichaReiser]

Stmt formatting can be so nice. Expressions are the real pain