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All run configurations default to `False` or `None` and are decided only
by CLI.
Check Configurations:
--------------------
Configurations that are related to which files and errors will be checked.
These are configurable in 2 ways: using the CLI, and using configuration
files.
Configuration files are nested within the file system, meaning that the
closer a configuration file is to a checked file, the more relevant it will
be. For instance, imagine this directory structure:
A
+-- tox.ini: sets `select=D100`
+-- B
+-- foo.py
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Then `foo.py` will not be checked for `D100`.
The configuration build algorithm is described in `self._get_config`.
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