code: def except_clause(self, except_loc, exc_opt):
          
          type_ = name = as_loc = name_loc = None
          loc = except_loc
          if exc_opt:
              type_, name_opt = exc_opt
              loc = loc.join(type_.loc)
              if name_opt:
                  as_loc, name_tok, name_node = name_opt
                  if name_tok:
                      name = name_tok.value
                      name_loc = name_tok.loc
                  else:
                      name = name_node
                      name_loc = name_node.loc
                  loc = loc.join(name_loc)
          return ast.ExceptHandler(type=type_, name=name,
                                   except_loc=except_loc, as_loc=as_loc, name_loc=name_loc,
                                   loc=loc)
docs: (2.6, 2.7) except_clause: 'except' [test [('as' | ',') test]]
          (3.0-) except_clause: 'except' [test ['as' NAME]]