PEP 8: Discourage use of return/break/continue in finally (#1174)

pep-0008.txt

@@ -1335,6 +1335,20 @@ Programming Recommendations
       No:    if greeting == True:
       Worse: if greeting is True:
 
+- Use of the flow control statements ``return``/``break``/``continue``
+  within the finally suite of a ``try...finally``, where the flow control
+  statement would jump outside the finally suite, is discouraged.  This
+  is because such statements will implicitly cancel any active exception
+  that is propagating through the finally suite.
+
+  No::
+
+      def foo():
+          try:
+              1 / 0
+          finally:
+              return 42
+
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