I believe this diff addresses the failure of formatException() to check it's parameter's datatype. I still maintain this should be re-opened since it's guaranteed to raise an exception when someone sets 'exc_info=TruthyValue' in kwargs. albeit with a more focused PR.


diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index 00a022039d..5c61cd56a1 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -533,6 +533,8 @@ class Formatter(object):
         This default implementation just uses
         traceback.print_exception()
         """
+        if not isinstance(ei, tuple) or ei[0] is None:
+            return ""
         sio = io.StringIO()
         tb = ei[2]
         # See issues #9427, #1553375. Commented out for now.
@@ -584,9 +586,7 @@ class Formatter(object):
         if self.usesTime():
             record.asctime = self.formatTime(record, self.datefmt)
         s = self.formatMessage(record)
-        if (isinstance(record.exc_info, tuple) and record.exc_info[0]):
-            # Intercept 'Boolean' - causes subscript error if passed to formatException,
-            # and empty Tuples which emit 'NoneType None' into message.
+        if record.exc_info:
             # Cache the traceback text to avoid converting it multiple times
             # (it's constant anyway)
             if not record.exc_text: