register_option(key: 'str', defval: 'object', doc: 'str' = '', validator: 'Callable[[object], Any] | None' = None, cb: 'Callable[[str], Any] | None' = None) -> 'None'
Fully-qualified key, e.g. "x.y.option - z".
Default value of the option.
Description of the option.
Function of a single argument, should raise :None:None:`ValueError` if called with a value which is not a legal value for the option.
a function of a single argument "key", which is called immediately after an option value is set/reset. key is the full name of the option.
Register an option in the package-wide pandas config object
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