Parameters: |
- key : str | None
The preference key to set. If None, a tuple of the valid
keys is returned, and value and home_dir are ignored.
- value : str | None
The value to assign to the preference key. If None, the key is
deleted.
- home_dir : str | None
The folder that contains the .mne config folder.
If None, it is found automatically.
- set_env : bool
If True (default), update os.environ in addition to
updating the MNE-Python config file.
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