class_docstr: Specifies how values should be parsed when creating a :class:`.Table`.
  
  :param null_values: A sequence of values which should be cast to
      :code:`None` when encountered by this data type.
class_docstr_tok: ["Specifies","how","values","should","be","parsed","when","creating","a",":","class",":","`",".Table","`",".",":","param","null_values",":","A","sequence","of","values","which","should","be","cast","to",":","code",":","`","None","`","when","encountered","by","this","data","type","."]
docstr: Coerce a given string value into this column's data type.
docstr_tok: ["Coerce","a","given","string","value","into","this","column","'s","data","type","."]
code: def cast(self, d):
      """
      Coerce a given string value into this column's data type.
      """
      raise NotImplementedError
  
imports: from agate.exceptions import CastError
label_desc: Use image node_id 3 for calling the DataType obj's underlying member method code with example usage: obj.cast(d) without return types