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For the `pants fmt ::` goal, having enabled the `pants.backend.python.lint.black` backend, I added this to pants.toml

```[black]
args = "--line-length 100 --exclude src/path/to/excluded/file.py"```
yet it is still formatted. Any thoughts?

I think pants pass the filenames explicitly to black, which will kind of trump your exclude setting. Use the `skip_black` option to not format particular sources:
<https://www.pantsbuild.org/docs/reference-python_sources#codeskip_blackcode>
See `overrides` if you have a target generator (such as `python_sources`) and want to skip a subset of files only (as well as `__defaults__` if you want to apply the same to more targets at once):
<https://www.pantsbuild.org/docs/targets#target-generation>
<https://www.pantsbuild.org/docs/targets#field-default-values>

e.g.
```# src/paht/to/excluded/BUILD
python_sources(
  overrides={
    "file.py": dict(skip_black=True)
  }
)```

or, to skip black for all files in a subtree:
```# src/path/to/excluded/BUILD
__defaults__({(python_sources, python_source): dict(skip_black=True)})```