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"""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 = ["exc_type", "exc_value", "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("exc_info"), prefix=sys_attr.prefix) attr = Attr(Name("sys"), call) attr[1].children[0].prefix = results["dot"].prefix attr.append(Subscript(index)) return Node(syms.power, attr, prefix=node.prefix)