text: """Fixer for sys.exc_{type, value, traceback}
  
  sys.exc_type -> sys.exc_info()[0]
  sys.exc_value -> sys.exc_info()[1]
  sys.exc_traceback -> sys.exc_info()[2]
  """
  
  # By Jeff Balogh and Benjamin Peterson
  
  # Local imports
  from .. import fixer_base
  from ..fixer_util import Attr, Call, Name, Number, Subscript, Node, syms
  
  class FixSysExc(fixer_base.BaseFix):
      # This order matches the ordering of sys.exc_info().
      exc_info = [u"exc_type", u"exc_value", u"exc_traceback"]
      BM_compatible = True
      PATTERN = """
                power< 'sys' trailer< dot='.' attribute=(%s) > >
                """ % '|'.join("'%s'" % e for e in exc_info)
  
      def transform(self, node, results):
          sys_attr = results["attribute"][0]
          index = Number(self.exc_info.index(sys_attr.value))
  
          call = Call(Name(u"exc_info"), prefix=sys_attr.prefix)
          attr = Attr(Name(u"sys"), call)
          attr[1].children[0].prefix = results["dot"].prefix
          attr.append(Subscript(index))
          return Node(syms.power, attr, prefix=node.prefix)
  