def __init__(self, **kwargs):
        if len(kwargs) == 0:
            raise ValueError("Override() doesn't override anything, needs keyword args")
        self.default_overridden = 'default' in kwargs
        if self.default_overridden:
            self.default = kwargs.pop('default')
        if len(kwargs) > 0:
            raise ValueError("Unknown keyword args to Override: %r" % (kwargs))
dataset/ETHPy150Open bokeh/bokeh/bokeh/core/properties.py/Override.__init__/original