From cf67d6a934b51b1f97e72945b596477b271f70b8 Mon Sep 17 00:00:00 2001 From: Dong-hee Na Date: Mon, 25 Jun 2018 13:11:09 +0900 Subject: bpo-33897: Add a 'force' keyword argument to logging.basicConfig(). (GH-7873) --- Doc/library/logging.rst | 11 ++++++++++- Lib/logging/__init__.py | 16 ++++++++++++++-- Lib/test/test_logging.py | 21 +++++++++++++++++++++ .../2018-06-23-18-09-28.bpo-33897.Hu0yvt.rst | 1 + 4 files changed, 46 insertions(+), 3 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2018-06-23-18-09-28.bpo-33897.Hu0yvt.rst diff --git a/Doc/library/logging.rst b/Doc/library/logging.rst index 774bd83..90fe92b 100644 --- a/Doc/library/logging.rst +++ b/Doc/library/logging.rst @@ -1131,7 +1131,7 @@ functions. if no handlers are defined for the root logger. This function does nothing if the root logger already has handlers - configured for it. + configured, unless the keyword argument *force* is set to ``True``. .. note:: This function should be called from the main thread before other threads are started. In versions of Python prior to @@ -1183,6 +1183,15 @@ functions. | | with 'filename' or 'stream' - if both are | | | present, a ``ValueError`` is raised. | +--------------+---------------------------------------------+ + | ``force`` | If this keyword argument is specified as | + | | true, any existing handlers attached to the | + | | root logger are removed and closed, before | + | | carrying out the configuration as specified | + | | by the other arguments. | + +--------------+---------------------------------------------+ + + .. versionchanged:: 3.8 + The ``force`` argument was added. .. versionchanged:: 3.2 The ``style`` argument was added. diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py index e6c9f32..29a7d46 100644 --- a/Lib/logging/__init__.py +++ b/Lib/logging/__init__.py @@ -1793,7 +1793,8 @@ def basicConfig(**kwargs): Do basic configuration for the logging system. This function does nothing if the root logger already has handlers - configured. It is a convenience method intended for use by simple scripts + configured, unless the keyword argument *force* is set to ``True``. + It is a convenience method intended for use by simple scripts to do one-shot configuration of the logging package. The default behaviour is to create a StreamHandler which writes to @@ -1821,13 +1822,19 @@ def basicConfig(**kwargs): handlers, which will be added to the root handler. Any handler in the list which does not have a formatter assigned will be assigned the formatter created in this function. - + force If this keyword is specified as true, any existing handlers + attached to the root logger are removed and closed, before + carrying out the configuration as specified by the other + arguments. Note that you could specify a stream created using open(filename, mode) rather than passing the filename and mode in. However, it should be remembered that StreamHandler does not close its stream (since it may be using sys.stdout or sys.stderr), whereas FileHandler closes its stream when the handler is closed. + .. versionchanged:: 3.8 + Added the ``force`` parameter. + .. versionchanged:: 3.2 Added the ``style`` parameter. @@ -1842,6 +1849,11 @@ def basicConfig(**kwargs): # basicConfig() from multiple threads _acquireLock() try: + force = kwargs.pop('force', False) + if force: + for h in root.handlers[:]: + root.removeHandler(h) + h.close() if len(root.handlers) == 0: handlers = kwargs.pop("handlers", None) if handlers is None: diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py index ba70b11..b3618bd 100644 --- a/Lib/test/test_logging.py +++ b/Lib/test/test_logging.py @@ -3901,6 +3901,27 @@ class BasicConfigTest(unittest.TestCase): self.assertIs(handlers[2].formatter, f) self.assertIs(handlers[0].formatter, handlers[1].formatter) + def test_force(self): + old_string_io = io.StringIO() + new_string_io = io.StringIO() + old_handlers = [logging.StreamHandler(old_string_io)] + new_handlers = [logging.StreamHandler(new_string_io)] + logging.basicConfig(level=logging.WARNING, handlers=old_handlers) + logging.warning('warn') + logging.info('info') + logging.debug('debug') + self.assertEqual(len(logging.root.handlers), 1) + logging.basicConfig(level=logging.INFO, handlers=new_handlers, + force=True) + logging.warning('warn') + logging.info('info') + logging.debug('debug') + self.assertEqual(len(logging.root.handlers), 1) + self.assertEqual(old_string_io.getvalue().strip(), + 'WARNING:root:warn') + self.assertEqual(new_string_io.getvalue().strip(), + 'WARNING:root:warn\nINFO:root:info') + def _test_log(self, method, level=None): # logging.root has no handlers so basicConfig should be called called = [] diff --git a/Misc/NEWS.d/next/Library/2018-06-23-18-09-28.bpo-33897.Hu0yvt.rst b/Misc/NEWS.d/next/Library/2018-06-23-18-09-28.bpo-33897.Hu0yvt.rst new file mode 100644 index 0000000..64ec3a1 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2018-06-23-18-09-28.bpo-33897.Hu0yvt.rst @@ -0,0 +1 @@ +Added a 'force' keyword argument to logging.basicConfig(). -- cgit v0.12