1 files changed, 29 insertions, 0 deletions
diff --git a/Lib/lib2to3/fixes/fix_sys_exc.py b/Lib/lib2to3/fixes/fix_sys_exc.py
new file mode 100644
index 0000000..18d9363
--- /dev/null
+++ b/Lib/lib2to3/fixes/fix_sys_exc.py
@@ -0,0 +1,29 @@
+"""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"]
+    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.get_prefix())
+        attr = Attr(Name("sys"), call)
+        attr[1].children[0].set_prefix(results["dot"].get_prefix())
+        attr.append(Subscript(index))
+        return Node(syms.power, attr, prefix=node.get_prefix())