bpo-39142: Avoid converting namedtuple instances to ConvertingTuple. (GH-17773)
This uses the heuristic of assuming a named tuple is a subclass of
tuple with a _fields attribute. This change means that contents of
a named tuple wouldn't be converted - if a user wants to have
ConvertingTuple functionality from a namedtuple, they will have to
implement it themselves.
diff --git a/Lib/logging/config.py b/Lib/logging/config.py
index 4a3b896..fd3aded 100644
--- a/Lib/logging/config.py
+++ b/Lib/logging/config.py
@@ -448,7 +448,7 @@
value = ConvertingList(value)
value.configurator = self
elif not isinstance(value, ConvertingTuple) and\
- isinstance(value, tuple):
+ isinstance(value, tuple) and not hasattr(value, '_fields'):
value = ConvertingTuple(value)
value.configurator = self
elif isinstance(value, str): # str for py3k