class_docstr: A class for representing multivariate rational function fields. 
docstr: Convert ``a`` to a SymPy object. 
code: def to_sympy(self, a):
      """Convert ``a`` to a SymPy object."""
      return a.as_expr()
  
imports: from sympy.polys.domains.compositedomain import CompositeDomain
  from sympy.polys.domains.field import Field
  from sympy.polys.polyerrors import CoercionFailed, GeneratorsError
  from sympy.utilities import public
label_desc: Use image node_id 9 for calling the FractionField obj's underlying member method code with example usage: obj.to_sympy(a) and returns: a