Add log.warning compatibility routine

Python logging has deprecating logging.warn and preferrs
logging.warning.  This change adds lsst.log.warning to
enable both forms to reduce cognitive dissonance between
the two logging packages.

python/lsst/log/log/logContinued.py

@@ -81,6 +81,9 @@ def info(self, fmt, *args):
     def warn(self, fmt, *args):
         self._log(Log.WARN, False, fmt, *args)
 
+    def warning(self, fmt, *args):
+        self.warn(fmt, *args)
+
     def error(self, fmt, *args):
         self._log(Log.ERROR, False, fmt, *args)
 
@@ -192,6 +195,10 @@ def warn(fmt, *args):
     Log.getDefaultLogger()._log(WARN, False, fmt, *args)
 
 
+def warning(fmt, *args):
+    warn(fmt, *args)
+
+
 def error(fmt, *args):
     Log.getDefaultLogger()._log(ERROR, False, fmt, *args)
 

tests/test_log.py

@@ -102,7 +102,7 @@ def testBasic(self):
             log.warn("This is WARN")
             log.error("This is ERROR")
             log.fatal("This is FATAL")
-            log.warn("Format %d %g %s", 3, 2.71828, "foo")
+            log.warning("Format %d %g %s", 3, 2.71828, "foo")
         self.check("""
 root INFO: This is INFO
 root INFO: This is unicode INFO
@@ -609,7 +609,7 @@ def testForwardToPythonContextManager(self):
 
         # Without forwarding we only get python logger messages captured
         with self.assertLogs(level="WARNING") as cm:
-            log.warn("lsst.log: not forwarded")
+            log.warning("lsst.log: not forwarded")
             logging.warning("Python logging: captured")
         self.assertEqual(len(cm.output), 1)