ERR: validation options that accept callables

[jreback]

#12704 (comment)

In [1]: pd.describe_option('float_format')
display.float_format : callable
    The callable should accept a floating point number and return
    a string with the desired format of the number. This is used
    in some places like SeriesFormatter.
    See core.format.EngFormatter for an example.
    [default: None] [currently: None]

This should raise

In [2]: pd.set_option('float_format','%.1f')

[jreback]

the issue is that in core/config_init.py float_format doesn't have a validator.

[tdhopper]

Right: here.

Is callable sufficient?

[jreback]

you could prob just create a is_callable = callable here

and validator=is_callable would work I think