bpo-37111: Add 'encoding' and 'errors' parameters to logging.basicCon… (GH-14008)

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Vinay Sajip 2019-06-17 17:40:52 +01:00 committed by GitHub
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8 changed files with 197 additions and 27 deletions

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@ -128,10 +128,18 @@ look at that next. Be sure to try the following in a newly-started Python
interpreter, and don't just continue from the session described above::
import logging
logging.basicConfig(filename='example.log',level=logging.DEBUG)
logging.basicConfig(filename='example.log', encoding='utf-8', level=logging.DEBUG)
logging.debug('This message should go to the log file')
logging.info('So should this')
logging.warning('And this, too')
logging.error('And non-ASCII stuff, too, like Øresund and Malmö')
.. versionchanged:: 3.9
The *encoding* argument was added. In earlier Python versions, or if not
specified, the encoding used is the default value used by :func:`open`. While
not shown in the above example, an *errors* argument can also now be passed,
which determines how encoding errors are handled. For available values and
the default, see the documentation for :func:`open`.
And now if we open the file and look at what we have, we should find the log
messages:
@ -141,6 +149,7 @@ messages:
DEBUG:root:This message should go to the log file
INFO:root:So should this
WARNING:root:And this, too
ERROR:root:And non-ASCII stuff, too, like Øresund and Malmö
This example also shows how you can set the logging level which acts as the
threshold for tracking. In this case, because we set the threshold to

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@ -89,18 +89,22 @@ sends logging output to a disk file. It inherits the output functionality from
:class:`StreamHandler`.
.. class:: FileHandler(filename, mode='a', encoding=None, delay=False)
.. class:: FileHandler(filename, mode='a', encoding=None, delay=False, errors=None)
Returns a new instance of the :class:`FileHandler` class. The specified file is
opened and used as the stream for logging. If *mode* is not specified,
:const:`'a'` is used. If *encoding* is not ``None``, it is used to open the file
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.
first call to :meth:`emit`. By default, the file grows indefinitely. If
*errors* is specified, it's used to determine how encoding errors are handled.
.. versionchanged:: 3.6
As well as string values, :class:`~pathlib.Path` objects are also accepted
for the *filename* argument.
.. versionchanged:: 3.9
The *errors* parameter was added.
.. method:: close()
Closes the file.
@ -168,18 +172,22 @@ exclusive locks - and so there is no need for such a handler. Furthermore,
for this value.
.. class:: WatchedFileHandler(filename, mode='a', encoding=None, delay=False)
.. class:: WatchedFileHandler(filename, mode='a', encoding=None, delay=False, errors=None)
Returns a new instance of the :class:`WatchedFileHandler` class. The specified
file is opened and used as the stream for logging. If *mode* is not specified,
:const:`'a'` is used. If *encoding* is not ``None``, it is used to open the file
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.
first call to :meth:`emit`. By default, the file grows indefinitely. If
*errors* is provided, it determines how encoding errors are handled.
.. versionchanged:: 3.6
As well as string values, :class:`~pathlib.Path` objects are also accepted
for the *filename* argument.
.. versionchanged:: 3.9
The *errors* parameter was added.
.. method:: reopenIfNeeded()
Checks to see if the file has changed. If it has, the existing stream is
@ -205,7 +213,7 @@ module, is the base class for the rotating file handlers,
not need to instantiate this class, but it has attributes and methods you may
need to override.
.. class:: BaseRotatingHandler(filename, mode, encoding=None, delay=False)
.. class:: BaseRotatingHandler(filename, mode, encoding=None, delay=False, errors=None)
The parameters are as for :class:`FileHandler`. The attributes are:
@ -284,13 +292,14 @@ The :class:`RotatingFileHandler` class, located in the :mod:`logging.handlers`
module, supports rotation of disk log files.
.. class:: RotatingFileHandler(filename, mode='a', maxBytes=0, backupCount=0, encoding=None, delay=False)
.. class:: RotatingFileHandler(filename, mode='a', maxBytes=0, backupCount=0, encoding=None, delay=False, errors=None)
Returns a new instance of the :class:`RotatingFileHandler` class. The specified
file is opened and used as the stream for logging. If *mode* is not specified,
``'a'`` is used. If *encoding* is not ``None``, it is used to open the file
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.
first call to :meth:`emit`. By default, the file grows indefinitely. If
*errors* is provided, it determines how encoding errors are handled.
You can use the *maxBytes* and *backupCount* values to allow the file to
:dfn:`rollover` at a predetermined size. When the size is about to be exceeded,
@ -311,6 +320,9 @@ module, supports rotation of disk log files.
As well as string values, :class:`~pathlib.Path` objects are also accepted
for the *filename* argument.
.. versionchanged:: 3.9
The *errors* parameter was added.
.. method:: doRollover()
Does a rollover, as described above.
@ -331,7 +343,7 @@ The :class:`TimedRotatingFileHandler` class, located in the
timed intervals.
.. class:: TimedRotatingFileHandler(filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False, atTime=None)
.. class:: TimedRotatingFileHandler(filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False, atTime=None, errors=None)
Returns a new instance of the :class:`TimedRotatingFileHandler` class. The
specified file is opened and used as the stream for logging. On rotating it also
@ -391,6 +403,9 @@ timed intervals.
rollover, and subsequent rollovers would be calculated via the normal
interval calculation.
If *errors* is specified, it's used to determine how encoding errors are
handled.
.. note:: Calculation of the initial rollover time is done when the handler
is initialised. Calculation of subsequent rollover times is done only
when rollover occurs, and rollover occurs only when emitting output. If
@ -411,6 +426,9 @@ timed intervals.
As well as string values, :class:`~pathlib.Path` objects are also accepted
for the *filename* argument.
.. versionchanged:: 3.9
The *errors* parameter was added.
.. method:: doRollover()
Does a rollover, as described above.

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@ -1196,6 +1196,21 @@ functions.
| | carrying out the configuration as specified |
| | by the other arguments. |
+--------------+---------------------------------------------+
| *encoding* | If this keyword argument is specified along |
| | with *filename*, its value is used when the |
| | FileHandler is created, and thus used when |
| | opening the output file. |
+--------------+---------------------------------------------+
| *errors* | If this keyword argument is specified along |
| | with *filename*, its value is used when the |
| | FileHandler is created, and thus used when |
| | opening the output file. If not specified, |
| | the value 'backslashreplace' is used. Note |
| | that if ``None`` is specified, it will be |
| | passed as such to func:`open`, which means |
| | that it will be treated the same as passing |
| | 'errors'. |
+--------------+---------------------------------------------+
.. versionchanged:: 3.2
The *style* argument was added.
@ -1209,6 +1224,9 @@ functions.
.. versionchanged:: 3.8
The *force* argument was added.
.. versionchanged:: 3.9
The *encoding* and *errors* arguments were added.
.. function:: shutdown()
Informs the logging system to perform an orderly shutdown by flushing and

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@ -81,6 +81,7 @@ howto/ipaddress,,::,IPv6Address('2001:db8::ffff:ffff')
howto/ipaddress,,:ffff,IPv6Address('2001:db8::ffff:ffff')
howto/logging,,:And,"WARNING:And this, too"
howto/logging,,:And,"WARNING:root:And this, too"
howto/logging,,:And,"ERROR:root:And non-ASCII stuff, too, like "
howto/logging,,:Doing,INFO:root:Doing something
howto/logging,,:Finished,INFO:root:Finished
howto/logging,,:logger,severity:logger name:message
@ -90,6 +91,7 @@ howto/logging,,:root,DEBUG:root:This message should go to the log file
howto/logging,,:root,INFO:root:Doing something
howto/logging,,:root,INFO:root:Finished
howto/logging,,:root,INFO:root:So should this
howto/logging,,:root,"ERROR:root:And non-ASCII stuff, too, like "
howto/logging,,:root,INFO:root:Started
howto/logging,,:root,"WARNING:root:And this, too"
howto/logging,,:root,WARNING:root:Look before you leap!

1 c-api/arg :ref PyArg_ParseTuple(args, "O|O:ref", &object, &callback)
81 howto/ipaddress :ffff IPv6Address('2001:db8::ffff:ffff')
82 howto/logging :And WARNING:And this, too
83 howto/logging :And WARNING:root:And this, too
84 howto/logging :And ERROR:root:And non-ASCII stuff, too, like
85 howto/logging :Doing INFO:root:Doing something
86 howto/logging :Finished INFO:root:Finished
87 howto/logging :logger severity:logger name:message
91 howto/logging :root INFO:root:Doing something
92 howto/logging :root INFO:root:Finished
93 howto/logging :root INFO:root:So should this
94 howto/logging :root ERROR:root:And non-ASCII stuff, too, like
95 howto/logging :root INFO:root:Started
96 howto/logging :root WARNING:root:And this, too
97 howto/logging :root WARNING:root:Look before you leap!

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@ -1,4 +1,4 @@
# Copyright 2001-2017 by Vinay Sajip. All Rights Reserved.
# Copyright 2001-2019 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) 2001-2017 Vinay Sajip. All Rights Reserved.
Copyright (C) 2001-2019 Vinay Sajip. All Rights Reserved.
To use, simply 'import logging' and log away!
"""
@ -1122,7 +1122,7 @@ class FileHandler(StreamHandler):
"""
A handler class which writes formatted logging records to disk files.
"""
def __init__(self, filename, mode='a', encoding=None, delay=False):
def __init__(self, filename, mode='a', encoding=None, delay=False, errors=None):
"""
Open the specified file and use it as the stream for logging.
"""
@ -1133,6 +1133,7 @@ class FileHandler(StreamHandler):
self.baseFilename = os.path.abspath(filename)
self.mode = mode
self.encoding = encoding
self.errors = errors
self.delay = delay
if delay:
#We don't open the stream, but we still need to call the
@ -1169,7 +1170,8 @@ class FileHandler(StreamHandler):
Open the current base file with the (original) mode and encoding.
Return the resulting stream.
"""
return open(self.baseFilename, self.mode, encoding=self.encoding)
return open(self.baseFilename, self.mode, encoding=self.encoding,
errors=self.errors)
def emit(self, record):
"""
@ -1928,15 +1930,20 @@ def basicConfig(**kwargs):
attached to the root logger are removed and closed, before
carrying out the configuration as specified by the other
arguments.
encoding If specified together with a filename, this encoding is passed to
the created FileHandler, causing it to be used when the file is
opened.
errors If specified together with a filename, this value is passed to the
created FileHandler, causing it to be used when the file is
opened in text mode. If not specified, the default value is
`backslashreplace`.
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.
@ -1946,12 +1953,20 @@ def basicConfig(**kwargs):
``filename``/``filemode``, or ``filename``/``filemode`` specified
together with ``stream``, or ``handlers`` specified together with
``stream``.
.. versionchanged:: 3.8
Added the ``force`` parameter.
.. versionchanged:: 3.9
Added the ``encoding`` and ``errors`` parameters.
"""
# Add thread safety in case someone mistakenly calls
# basicConfig() from multiple threads
_acquireLock()
try:
force = kwargs.pop('force', False)
encoding = kwargs.pop('encoding', None)
errors = kwargs.pop('errors', 'backslashreplace')
if force:
for h in root.handlers[:]:
root.removeHandler(h)
@ -1970,7 +1985,10 @@ def basicConfig(**kwargs):
filename = kwargs.pop("filename", None)
mode = kwargs.pop("filemode", 'a')
if filename:
h = FileHandler(filename, mode)
if 'b'in mode:
errors = None
h = FileHandler(filename, mode,
encoding=encoding, errors=errors)
else:
stream = kwargs.pop("stream", None)
h = StreamHandler(stream)

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@ -48,13 +48,16 @@ class BaseRotatingHandler(logging.FileHandler):
Not meant to be instantiated directly. Instead, use RotatingFileHandler
or TimedRotatingFileHandler.
"""
def __init__(self, filename, mode, encoding=None, delay=False):
def __init__(self, filename, mode, encoding=None, delay=False, errors=None):
"""
Use the specified filename for streamed logging
"""
logging.FileHandler.__init__(self, filename, mode, encoding, delay)
logging.FileHandler.__init__(self, filename, mode=mode,
encoding=encoding, delay=delay,
errors=errors)
self.mode = mode
self.encoding = encoding
self.errors = errors
self.namer = None
self.rotator = None
@ -117,7 +120,8 @@ class RotatingFileHandler(BaseRotatingHandler):
Handler for logging to a set of files, which switches from one file
to the next when the current file reaches a certain size.
"""
def __init__(self, filename, mode='a', maxBytes=0, backupCount=0, encoding=None, delay=False):
def __init__(self, filename, mode='a', maxBytes=0, backupCount=0,
encoding=None, delay=False, errors=None):
"""
Open the specified file and use it as the stream for logging.
@ -145,7 +149,8 @@ class RotatingFileHandler(BaseRotatingHandler):
# on each run.
if maxBytes > 0:
mode = 'a'
BaseRotatingHandler.__init__(self, filename, mode, encoding, delay)
BaseRotatingHandler.__init__(self, filename, mode, encoding=encoding,
delay=delay, errors=errors)
self.maxBytes = maxBytes
self.backupCount = backupCount
@ -196,8 +201,11 @@ class TimedRotatingFileHandler(BaseRotatingHandler):
If backupCount is > 0, when rollover is done, no more than backupCount
files are kept - the oldest ones are deleted.
"""
def __init__(self, filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False, atTime=None):
BaseRotatingHandler.__init__(self, filename, 'a', encoding, delay)
def __init__(self, filename, when='h', interval=1, backupCount=0,
encoding=None, delay=False, utc=False, atTime=None,
errors=None):
BaseRotatingHandler.__init__(self, filename, 'a', encoding=encoding,
delay=delay, errors=errors)
self.when = when.upper()
self.backupCount = backupCount
self.utc = utc
@ -431,8 +439,11 @@ class WatchedFileHandler(logging.FileHandler):
This handler is based on a suggestion and patch by Chad J.
Schroeder.
"""
def __init__(self, filename, mode='a', encoding=None, delay=False):
logging.FileHandler.__init__(self, filename, mode, encoding, delay)
def __init__(self, filename, mode='a', encoding=None, delay=False,
errors=None):
logging.FileHandler.__init__(self, filename, mode=mode,
encoding=encoding, delay=delay,
errors=errors)
self.dev, self.ino = -1, -1
self._statstream()

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@ -1,4 +1,4 @@
# Copyright 2001-2017 by Vinay Sajip. All Rights Reserved.
# Copyright 2001-2019 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,
@ -16,7 +16,7 @@
"""Test harness for the logging module. Run all tests.
Copyright (C) 2001-2017 Vinay Sajip. All Rights Reserved.
Copyright (C) 2001-2019 Vinay Sajip. All Rights Reserved.
"""
import logging
@ -4445,6 +4445,99 @@ class BasicConfigTest(unittest.TestCase):
self.assertEqual(new_string_io.getvalue().strip(),
'WARNING:root:warn\nINFO:root:info')
def test_encoding(self):
try:
encoding = 'utf-8'
logging.basicConfig(filename='test.log', encoding=encoding,
errors='strict',
format='%(message)s', level=logging.DEBUG)
self.assertEqual(len(logging.root.handlers), 1)
handler = logging.root.handlers[0]
self.assertIsInstance(handler, logging.FileHandler)
self.assertEqual(handler.encoding, encoding)
logging.debug('The Øresund Bridge joins Copenhagen to Malmö')
finally:
handler.close()
with open('test.log', encoding='utf-8') as f:
data = f.read().strip()
os.remove('test.log')
self.assertEqual(data,
'The Øresund Bridge joins Copenhagen to Malmö')
def test_encoding_errors(self):
try:
encoding = 'ascii'
logging.basicConfig(filename='test.log', encoding=encoding,
errors='ignore',
format='%(message)s', level=logging.DEBUG)
self.assertEqual(len(logging.root.handlers), 1)
handler = logging.root.handlers[0]
self.assertIsInstance(handler, logging.FileHandler)
self.assertEqual(handler.encoding, encoding)
logging.debug('The Øresund Bridge joins Copenhagen to Malmö')
finally:
handler.close()
with open('test.log', encoding='utf-8') as f:
data = f.read().strip()
os.remove('test.log')
self.assertEqual(data, 'The resund Bridge joins Copenhagen to Malm')
def test_encoding_errors_default(self):
try:
encoding = 'ascii'
logging.basicConfig(filename='test.log', encoding=encoding,
format='%(message)s', level=logging.DEBUG)
self.assertEqual(len(logging.root.handlers), 1)
handler = logging.root.handlers[0]
self.assertIsInstance(handler, logging.FileHandler)
self.assertEqual(handler.encoding, encoding)
self.assertEqual(handler.errors, 'backslashreplace')
logging.debug('😂: ☃️: The Øresund Bridge joins Copenhagen to Malmö')
finally:
handler.close()
with open('test.log', encoding='utf-8') as f:
data = f.read().strip()
os.remove('test.log')
self.assertEqual(data, r'\U0001f602: \u2603\ufe0f: The \xd8resund '
r'Bridge joins Copenhagen to Malm\xf6')
def test_encoding_errors_none(self):
# Specifying None should behave as 'strict'
try:
encoding = 'ascii'
logging.basicConfig(filename='test.log', encoding=encoding,
errors=None,
format='%(message)s', level=logging.DEBUG)
self.assertEqual(len(logging.root.handlers), 1)
handler = logging.root.handlers[0]
self.assertIsInstance(handler, logging.FileHandler)
self.assertEqual(handler.encoding, encoding)
self.assertIsNone(handler.errors)
message = []
def dummy_handle_error(record):
_, v, _ = sys.exc_info()
message.append(str(v))
handler.handleError = dummy_handle_error
logging.debug('The Øresund Bridge joins Copenhagen to Malmö')
self.assertTrue(message)
self.assertIn("'ascii' codec can't encode "
"character '\\xd8' in position 4:", message[0])
finally:
handler.close()
with open('test.log', encoding='utf-8') as f:
data = f.read().strip()
os.remove('test.log')
# didn't write anything due to the encoding error
self.assertEqual(data, r'')
def _test_log(self, method, level=None):
# logging.root has no handlers so basicConfig should be called
called = []

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@ -0,0 +1 @@
Added ``encoding`` and ``errors`` keyword parameters to ``logging.basicConfig``.