docstr: Ordered list of field names, or None if there are no fields.
  
  This is for compatibility with NumPy arrays, and may be removed in the
  future.
docstr_tok: ["Ordered","list","of","field","names",",","or","None","if","there","are","no","fields",".","This","is","for","compatibility","with","NumPy","arrays",",","and","may","be","removed","in","the","future","."]
code: def names(self):
      # type: () -> Optional[List[str]]
      """Ordered list of field names, or None if there are no fields.
  
      This is for compatibility with NumPy arrays, and may be removed in the
      future.
      """
      return None
  
imports: import numpy
  from pandas.errors import AbstractMethodError
  from pandas.core.dtypes.generic import ABCDataFrame, ABCIndexClass, ABCSeries
  from pandas import compat
label_desc: Use image node_id 4 for calling the _DtypeOpsMixin obj's underlying member method code with example usage: obj.names() and returns: None