class_docstr: A class for representing multivariate rational function fields. 
docstr: Convert a Python ``int`` object to ``dtype``. 
code: def from_ZZ(K1, a, K0):
      """Convert a Python ``int`` object to ``dtype``."""
      return K1(K1.domain.convert(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 11 for calling the FractionField obj's underlying member method code with example usage: obj.from_ZZ(K1, a, K0) and returns: K1