Merged in krisvale/six (pull request #72)

Delete exception variables in frames that raise exceptions.

1 files changed, 22 insertions, 10 deletions

diff --git a/six.py b/six.py
index 6ca60a2..d35ec5b 100644
--- a/six.py
+++ b/six.py
@@ -679,11 +679,14 @@ if PY3:
     exec_ = getattr(moves.builtins, "exec")
 
     def reraise(tp, value, tb=None):
-        if value is None:
-            value = tp()
-        if value.__traceback__ is not tb:
-            raise value.with_traceback(tb)
-        raise value
+        try:
+            if value is None:
+                value = tp()
+            if value.__traceback__ is not tb:
+                raise value.with_traceback(tb)
+            raise value
+        finally:
+            del value, tb
 
 else:
     def exec_(_code_, _globs_=None, _locs_=None):
@@ -699,19 +702,28 @@ else:
         exec("""exec _code_ in _globs_, _locs_""")
 
     exec_("""def reraise(tp, value, tb=None):
-    raise tp, value, tb
+    try:
+        raise tp, value, tb
+    finally:
+        del tb
 """)
 
 
 if sys.version_info[:2] == (3, 2):
     exec_("""def raise_from(value, from_value):
-    if from_value is None:
-        raise value
-    raise value from from_value
+    try:
+        if from_value is None:
+            raise value
+        raise value from from_value
+    finally:
+        del value
 """)
 elif sys.version_info[:2] > (3, 2):
     exec_("""def raise_from(value, from_value):
-    raise value from from_value
+    try:
+        raise value from from_value
+    finally:
+        del value
 """)
 else:
     def raise_from(value, from_value):