class_docstr: A class for arbitrary expressions. 
class_docstr_tok: ["A","class","for","arbitrary","expressions","."]
docstr: Returns a field associated with ``self``. 
docstr_tok: ["Returns","a","field","associated","with","``","self","``","."]
code: def get_field(self):
      """Returns a field associated with ``self``."""
      return self
  
imports: from sympy.core import sympify, SympifyError
  from sympy.polys.domains.domainelement import DomainElement
  from sympy.polys.domains.characteristiczero import CharacteristicZero
  from sympy.polys.domains.field import Field
  from sympy.polys.domains.simpledomain import SimpleDomain
  from sympy.polys.polyutils import PicklableWithSlots
  from sympy.utilities import public
label_desc: Use image node_id 21 for calling the ExpressionDomain obj's underlying member method code with example usage: obj.get_field() and returns: self