class_docstr: A class for representing multivariate rational function fields. 
docstr: Convert a Python ``Fraction`` object to ``dtype``. 
code: def from_QQ(K1, a, K0):
      """Convert a Python ``Fraction`` object to ``dtype``."""
      dom = K1.domain
      conv = dom.convert_from
      if dom.is_ZZ:
          return K1(conv(K0.numer(a), K0)) / K1(conv(K0.denom(a), K0))
      else:
          return K1(conv(a, K0))
  
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 13 for calling the FractionField obj's underlying member method code with example usage: obj.from_QQ(K1, a, K0) and returns: unknown, K1