class_docstr: Represents a ring domain. 
class_docstr_tok: ["Represents","a","ring","domain","."]
docstr: Returns numerator of ``a``. 
docstr_tok: ["Returns","numerator","of","``","a","``","."]
code: def numer(self, a):
      """Returns numerator of ``a``."""
      return a
  
file_path: sympy/sympy/polys/domains/ring.py
imports: from sympy.polys.domains.domain import Domain
  from sympy.polys.polyerrors import ExactQuotientFailed, NotInvertible, NotReversible
  from sympy.utilities import public
label_desc: Use image node_id 9 for calling the Ring obj's underlying member method code with example usage: obj.numer(a) and returns: a