code: def get_abbr_impl(env):
      
      impl = env.python_implementation
  
      if impl == "PyPy":
          return "pp"
      elif impl == "Jython":
          return "jy"
      elif impl == "IronPython":
          return "ip"
      elif impl == "CPython":
          return "cp"
  
      raise LookupError("Unknown Python implementation: " + impl)
docs: Return abbreviated implementation name.