code: def lookup_facade(name, version):
      
      for _version in range(int(version), 0, -1):
          try:
              facade = getattr(CLIENTS[str(_version)], name)
              return facade
          except (KeyError, AttributeError):
              continue
      else:
          raise ImportError("No supported version for facade: "
                            "{}".format(name))
docs: Given a facade name and version, attempt to pull that facade out
      of the correct client<version>.py file.