[Python-checkins] bpo-42644: Validate values in logging.disable() (#23786)

asvetlov webhook-mailer at python.org
Wed Dec 16 04:43:48 EST 2020

commit: b32d8b4f9bcd2e7d11240b6b9de0262cf8f5e09d
branch: master
author: Matthias Bussonnier <bussonniermatthias at gmail.com>
committer: asvetlov <andrew.svetlov at gmail.com>
date: 2020-12-16T11:43:39+02:00

bpo-42644: Validate values in logging.disable() (#23786)

* bpo-42644: Validate values in logging.disable()

Technically make the value of manager a property that checks and convert
values assigned to it properly. This has the side effect of making
`logging.disable` also accept strings representing the various level of

We want to validate the type of the disable attribute at assignment
time, as it is later compared to other levels when emitting warnings and
would generate a `TypeError: '>=' not supported between ....` in a
different part of the code base, which can make it difficult to track

When assigned an incorrect value; it will raise a TypeError when the
wrong type, or ValueError if an invalid str.

Co-authored-by: Andrew Svetlov <andrew.svetlov at gmail.com>

A Misc/NEWS.d/next/Library/2020-12-15-10-00-04.bpo-42644.XgLCNx.rst
M Lib/logging/__init__.py
M Lib/test/test_logging.py

diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index badfd654b1689..50b7378cd6386 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -1289,6 +1289,14 @@ def __init__(self, rootnode):
         self.loggerClass = None
         self.logRecordFactory = None
+    @property
+    def disable(self):
+        return self._disable
+    @disable.setter
+    def disable(self, value):
+        self._disable = _checkLevel(value)
     def getLogger(self, name):
         Get a logger with the specified name (channel name), creating it
diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index e2196736dcdf4..859baa4738ba7 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -4219,6 +4219,15 @@ def test_disable(self):
         self.assertEqual(logging.root.manager.disable, 83)
+        self.assertRaises(ValueError, logging.disable, "doesnotexists")
+        class _NotAnIntOrString:
+            pass
+        self.assertRaises(TypeError, logging.disable, _NotAnIntOrString())
+        logging.disable("WARN")
         # test the default value introduced in 3.7
         # (Issue #28524)
diff --git a/Misc/NEWS.d/next/Library/2020-12-15-10-00-04.bpo-42644.XgLCNx.rst b/Misc/NEWS.d/next/Library/2020-12-15-10-00-04.bpo-42644.XgLCNx.rst
new file mode 100644
index 0000000000000..f58b58e4002ad
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-12-15-10-00-04.bpo-42644.XgLCNx.rst
@@ -0,0 +1,3 @@
+`logging.disable` will now validate the types and value of its parameter. It
+also now accepts strings representing the levels (as does `loging.setLevel`)
+instead of only the numerical values.

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