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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def fromJSON(cls, jdata):
 """ Generates a new column from the given json data. This should be already loaded into a Python dictionary, not a JSON string. :param jdata | <dict> :return <orb.Column> || None """

        cls_type = jdata.get('type')
        col_cls = cls.byName(cls_type)

        if not col_cls:
            raise orb.errors.ColumnTypeNotFound(cls_type)
        else:
            col = col_cls()
            col.loadJSON(jdata)
            return col