Closes #27493: accepted Path objects in file handlers for logging.

Doc/library/logging.handlers.rst

@@ -84,6 +84,9 @@ sends logging output to a disk file.  It inherits the output functionality from
    with that encoding.  If *delay* is true, then file opening is deferred until the
    first call to :meth:`emit`. By default, the file grows indefinitely.
 
+   .. versionchanged:: 3.6
+      As well as string values, :class:`~pathlib.Path` objects are also accepted
+      for the *filename* argument.
 
    .. method:: close()
 
@@ -160,6 +163,9 @@ for this value.
    with that encoding.  If *delay* is true, then file opening is deferred until the
    first call to :meth:`emit`.  By default, the file grows indefinitely.
 
+   .. versionchanged:: 3.6
+      As well as string values, :class:`~pathlib.Path` objects are also accepted
+      for the *filename* argument.
 
    .. method:: reopenIfNeeded()
 
@@ -287,6 +293,9 @@ module, supports rotation of disk log files.
    :file:`app.log.2`, etc.  exist, then they are renamed to :file:`app.log.2`,
    :file:`app.log.3` etc.  respectively.
 
+   .. versionchanged:: 3.6
+      As well as string values, :class:`~pathlib.Path` objects are also accepted
+      for the *filename* argument.
 
    .. method:: doRollover()
 
@@ -365,6 +374,10 @@ timed intervals.
    .. versionchanged:: 3.4
       *atTime* parameter was added.
 
+   .. versionchanged:: 3.6
+      As well as string values, :class:`~pathlib.Path` objects are also accepted
+      for the *filename* argument.
+
    .. method:: doRollover()
 
       Does a rollover, as described above.

Lib/logging/__init__.py

-# Copyright 2001-2015 by Vinay Sajip. All Rights Reserved.
+# Copyright 2001-2016 by Vinay Sajip. All Rights Reserved.
 #
 # Permission to use, copy, modify, and distribute this software and its
 # documentation for any purpose and without fee is hereby granted,
@@ -18,7 +18,7 @@
 Logging package for Python. Based on PEP 282 and comments thereto in
 comp.lang.python.
 
-Copyright (C) 2001-2015 Vinay Sajip. All Rights Reserved.
+Copyright (C) 2001-2016 Vinay Sajip. All Rights Reserved.
 
 To use, simply 'import logging' and log away!
 """
@@ -994,6 +994,8 @@ class FileHandler(StreamHandler):
         """
         Open the specified file and use it as the stream for logging.
         """
+        # Issue #27493: add support for Path objects to be passed in
+        filename = os.fspath(filename)
         #keep the absolute path, otherwise derived classes which use this
         #may come a cropper when the current directory changes
         self.baseFilename = os.path.abspath(filename)

Lib/logging/handlers.py

@@ -246,6 +246,9 @@ class TimedRotatingFileHandler(BaseRotatingHandler):
 
         self.extMatch = re.compile(self.extMatch, re.ASCII)
         self.interval = self.interval * interval # multiply by units requested
+        # The following line added because the filename passed in could be a
+        # path object (see Issue #27493), but self.baseFilename will be a string
+        filename = self.baseFilename
         if os.path.exists(filename):
             t = os.stat(filename)[ST_MTIME]
         else:

Lib/test/test_logging.py

@@ -26,6 +26,7 @@ import logging.config
 import codecs
 import configparser
 import datetime
+import pathlib
 import pickle
 import io
 import gc
@@ -575,6 +576,29 @@ class HandlerTest(BaseTest):
         self.assertFalse(h.shouldFlush(r))
         h.close()
 
+    def test_path_objects(self):
+        """
+        Test that Path objects are accepted as filename arguments to handlers.
+
+        See Issue #27493.
+        """
+        fd, fn = tempfile.mkstemp()
+        os.close(fd)
+        os.unlink(fn)
+        pfn = pathlib.Path(fn)
+        cases = (
+                    (logging.FileHandler, (pfn, 'w')),
+                    (logging.handlers.RotatingFileHandler, (pfn, 'a')),
+                    (logging.handlers.TimedRotatingFileHandler, (pfn, 'h')),
+                )
+        if sys.platform in ('linux', 'darwin'):
+            cases += ((logging.handlers.WatchedFileHandler, (pfn, 'w')),)
+        for cls, args in cases:
+            h = cls(*args)
+            self.assertTrue(os.path.exists(fn))
+            os.unlink(fn)
+            h.close()
+
     @unittest.skipIf(os.name == 'nt', 'WatchedFileHandler not appropriate for Windows.')
     @unittest.skipUnless(threading, 'Threading required for this test.')
     def test_race(self):