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Change verbose to standard logging library
Change verbose to standard logging library PEP8 fixes and formatting of log messages @anntzer PEP8 fixes and formatting of log messages @anntzer Small fixes as suggested by @aantzer and @tacaswell Documentation Fix on merge Number small fixes Small fix for docs Small fix for error in animate.py fixed import order and small doc fix Small doc fix Changed log. to _log. Fix on merge Number small fixes Small fix for docs Small fix for error in animate.py fixed import order and small doc fix Small doc fix Changed log. to _log. Changed log. to _log. fixed fonts gah gah gah gah gah gah PEP8 doc fix revert _base.py fix missing _log Fixes for @efiring Fixes for @anntzer minor Doc link fixes @anntzer Small doc change Many small changes, thanks @QuLogic and @anntzer Link error docs
1 parent 7252158 commit 844877c

24 files changed

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‎doc/devel/contributing.rst‎

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@@ -171,7 +171,7 @@ repository <https://github.com/matplotlib/matplotlib/>`__ on GitHub,
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then submit a "pull request" (PR).
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The best practices for using GitHub to make PRs to Matplotlib are
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documented in the :ref:`development-workflow` section.
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documented in the :ref:`development-workflow` section.
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A brief overview is:
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@@ -437,6 +437,70 @@ forced to use ``**kwargs``. An example is
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elif len(args) == 1:
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...etc...
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.. _using_logging:
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Using logging for debug messages
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--------------------------------
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Matplotlib uses the standard python `logging` library to write verbose
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warnings, information, and
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debug messages. Please use it! In all those places you write :func:`print()`
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statements to do your debugging, try using :func:`log.debug()` instead!
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To include `logging` in your module, at the top of the module, you need to
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``import logging``. Then calls in your code like::
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_log = logging.getLogger(__name__) # right after the imports
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# code
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# more code
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_log.info('Here is some information')
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_log.debug('Here is some more detailed information')
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will log to a logger named ``matplotlib.yourmodulename``.
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If an end-user of Matplotlib sets up `logging` to display at levels
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more verbose than `logger.WARNING` in their code as follows::
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import logging
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fmt = '%(name)s:%(lineno)5d - %(levelname)s - %(message)s'
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logging.basicConfig(level=logging.DEBUG, format=fmt)
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import matplotlib.pyplot as plt
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Then they will receive messages like::
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matplotlib.backends: 89 - INFO - backend MacOSX version unknown
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matplotlib.yourmodulename: 347 - INFO - Here is some information
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matplotlib.yourmodulename: 348 - DEBUG - Here is some more detailed information
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Which logging level to use?
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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There are five levels at which you can emit messages.
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`logging.critical` and `logging.error`
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are really only there for errors that will end the use of the library but
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not kill the interpreter. `logging.warning` overlaps with the
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``warnings`` library. The
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`logging tutorial <https://docs.python.org/3/howto/logging.html#logging-basic-tutorial>`_
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suggests that the difference
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between `logging.warning` and `warnings.warn` is that
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`warnings.warn` be used for things the user must change to stop
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the warning, whereas `logging.warning` can be more persistent.
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By default, `logging` displays all log messages at levels higher than
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`logging.WARNING` to `sys.stderr`.
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Calls to `logging.info` are not displayed by default. They are for
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information that the user may want to know if the program behaves oddly.
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For instance, if an object isn't drawn because its position is ``NaN``,
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that can usually be ignored, but a mystified user could set
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``logging.basicConfig(level=logging.INFO)`` and get an error message that
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says why.
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`logging.debug` is the least likely to be displayed, and hence can
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be the most verbose.
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.. _custom_backend:
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Developing a new backend

‎doc/faq/troubleshooting_faq.rst‎

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@@ -9,10 +9,10 @@ Troubleshooting
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.. _matplotlib-version:
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Obtaining matplotlib version
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Obtaining Matplotlib version
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============================
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To find out your matplotlib version number, import it and print the
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To find out your Matplotlib version number, import it and print the
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``__version__`` attribute::
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>>> import matplotlib
@@ -25,7 +25,7 @@ To find out your matplotlib version number, import it and print the
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:file:`matplotlib` install location
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===================================
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You can find what directory matplotlib is installed in by importing it
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You can find what directory Matplotlib is installed in by importing it
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and printing the ``__file__`` attribute::
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>>> import matplotlib
@@ -37,7 +37,7 @@ and printing the ``__file__`` attribute::
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:file:`matplotlib` configuration and cache directory locations
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==============================================================
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Each user has a matplotlib configuration directory which may contain a
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Each user has a Matplotlib configuration directory which may contain a
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:ref:`matplotlibrc <customizing-with-matplotlibrc-files>` file. To
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locate your :file:`matplotlib/` configuration directory, use
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:func:`matplotlib.get_configdir`::
@@ -79,7 +79,7 @@ directory and the cache directory.
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Getting help
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============
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82-
There are a number of good resources for getting help with matplotlib.
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There are a number of good resources for getting help with Matplotlib.
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There is a good chance your question has already been asked:
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8585
- The `mailing list archive <http://matplotlib.1069221.n5.nabble.com/>`_.
@@ -114,11 +114,35 @@ provide the following information in your e-mail to the `mailing list
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the error will help you find a bug in *your* code that is causing the
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problem.
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117-
* You can get very helpful debugging output from matlotlib by running your
118-
script with a ``verbose-helpful`` or ``--verbose-debug`` flags and posting
119-
the verbose output the lists::
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* You can get helpful debugging output from Matlotlib by using the `logging`
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library in your code and posting the verbose output to the lists. For a
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command-line version of this, try::
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121-
python simple_plot.py --verbose-helpful > output.txt
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python -c "from logging import *; basicConfig(level=DEBUG); from pylab import *; plot(); show()"
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123+
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If you want to put the debugging hooks in your own code, then the
125+
most simple way to do so is to insert the following *before* any calls
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to ``import matplotlib``::
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import logging
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logging.basicConfig(level=logging.DEBUG)
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131+
import matplotlib.pyplot as plt
132+
133+
Note that if you want to use `logging` in your own code, but do not
134+
want verbose Matplotlib output, you can set the logging level
135+
for Matplotlib independently::
136+
137+
import logging
138+
# set DEBUG for everything
139+
logging.basicConfig(level=logging.DEBUG)
140+
logger = logging.getLogger('matplotlib')
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# set WARNING for Matplotlib
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logger.setLevel(logging.WARNING)
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The `logging` module is very flexible, and can be a valuable tool in chasing
145+
down errors.
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If you compiled Matplotlib yourself, please also provide:
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‎doc/users/next_whats_new/2017_10_10_logging.rst‎

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@@ -0,0 +1,24 @@
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Logging for debug output
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------------------------
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Matplotlib has in the past (sporadically) used an internal
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verbose-output reporter. This version converts those calls to using the
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standard python `logging` library.
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8+
Support for the old ``rcParams`` ``verbose.level`` and ``verbose.fileo`` is
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dropped.
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11+
The command-line options ``--verbose-helpful`` and ``--verbose-debug`` are
12+
still accepted, but deprecated. They are now equivalent to setting
13+
``logging.INFO`` and ``logging.DEBUG``.
14+
15+
The logger's root name is ``matplotlib`` and can be accessed from programs
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as::
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18+
import logging
19+
mlog = logging.getLogger('matplotlib')
20+
21+
Instructions for basic usage are in :ref:`troubleshooting-faq` and for
22+
developers in :ref:`contributing`.
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24+
.. _logging: https://docs.python.org/3/library/logging.html

‎lib/matplotlib/__init__.py‎

Lines changed: 109 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -113,6 +113,7 @@
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import inspect
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import itertools
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import locale
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import logging
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import os
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import re
118119
import sys
@@ -137,6 +138,8 @@
137138
__version__ = str(get_versions()['version'])
138139
del get_versions
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141+
_log = logging.getLogger(__name__)
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140143
__version__numpy__ = str('1.7.1') # minimum required numpy version
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142145
__bibtex__ = r"""@Article{Hunter:2007,
@@ -160,6 +163,9 @@
160163
if not (_python27 or _python34):
161164
raise ImportError("Matplotlib requires Python 2.7 or 3.4 or later")
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166+
if _python27:
167+
_log.addHandler(logging.NullHandler())
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163169

164170
def compare_versions(a, b):
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"return True if a is greater than or equal to b"
@@ -215,7 +221,75 @@ def _is_writable_dir(p):
215221
"""
216222
return os.access(p, os.W_OK) and os.path.isdir(p)
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224+
_verbose_msg = """\
225+
Command line argument --verbose-LEVEL is deprecated.
226+
This functionality is now provided by the standard
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python logging library. To get more (or less) logging output:
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import logging
229+
logger = logging.getLogger('matplotlib')
230+
logger.set_level(logging.INFO)"""
231+
232+
233+
def _set_logger_verbose_level(level_str='silent', file_str='sys.stdout'):
234+
"""
235+
Use a --verbose-LEVEL level to set the logging level:
236+
237+
"""
238+
levelmap = {'silent': logging.WARNING, 'helpful': logging.INFO,
239+
'debug': logging.DEBUG, 'debug-annoying': logging.DEBUG,
240+
'info': logging.INFO, 'warning': logging.WARNING}
241+
# Check that current state of logger isn't already more verbose
242+
# than the requested level. If it is more verbose, then leave more
243+
# verbose.
244+
newlev = levelmap[level_str]
245+
oldlev = _log.getEffectiveLevel()
246+
if newlev < oldlev:
247+
_log.setLevel(newlev)
248+
std = {
249+
'sys.stdout': sys.stdout,
250+
'sys.stderr': sys.stderr,
251+
}
252+
if file_str in std:
253+
fileo = std[file_str]
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else:
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fileo = sys.stdout
256+
try:
257+
fileo = open(file_str, 'w')
258+
# if this fails, we will just write to stdout
259+
except IOError:
260+
warnings.warn('could not open log file "{0}"'
261+
'for writing. Check your '
262+
'matplotlibrc'.format(file_str))
263+
console = logging.StreamHandler(fileo)
264+
console.setLevel(newlev)
265+
_log.addHandler(console)
266+
267+
268+
def _parse_commandline():
269+
"""
270+
Check for --verbose-LEVEL type command line arguments and
271+
set logging level appropriately.
272+
"""
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274+
levels = ('silent', 'helpful', 'debug', 'debug-annoying',
275+
'info', 'warning')
276+
277+
for arg in sys.argv[1:]:
278+
# cast to str because we are using unicode_literals,
279+
# and argv is always str
280+
281+
if arg.startswith(str('--verbose-')):
282+
level_str = arg[10:]
283+
# If it doesn't match one of ours, then don't even
284+
# bother noting it, we are just a 3rd-party library
285+
# to somebody else's script.
286+
if level_str in levels:
287+
_set_logger_verbose_level(level_str)
288+
289+
_parse_commandline()
290+
291+
292+
@cbook.deprecated("2.2", message=_verbose_msg)
219293
class Verbose(object):
220294
"""
221295
A class to handle reporting. Set the fileo attribute to any file
@@ -311,7 +385,29 @@ def ge(self, level):
311385
return self.vald[self.level] >= self.vald[level]
312386

313387

314-
verbose = Verbose()
388+
def _wrap(fmt, func, level='INFO', always=True):
389+
"""
390+
return a callable function that wraps func and reports its
391+
output through logger
392+
393+
if always is True, the report will occur on every function
394+
call; otherwise only on the first time the function is called
395+
"""
396+
assert callable(func)
397+
398+
def wrapper(*args, **kwargs):
399+
ret = func(*args, **kwargs)
400+
401+
if (always or not wrapper._spoke):
402+
lvl = logging.getLevelName(level.upper())
403+
_log.log(lvl, fmt % ret)
404+
spoke = True
405+
if not wrapper._spoke:
406+
wrapper._spoke = spoke
407+
return ret
408+
wrapper._spoke = False
409+
wrapper.__doc__ = func.__doc__
410+
return wrapper
315411

316412

317413
def checkdep_dvipng():
@@ -512,7 +608,7 @@ def _create_tmp_config_dir():
512608
return configdir
513609

514610

515-
get_home = verbose.wrap('$HOME=%s', _get_home, always=False)
611+
get_home = _wrap('$HOME=%s', _get_home, always=False)
516612

517613

518614
def _get_xdg_config_dir():
@@ -601,7 +697,7 @@ def _get_configdir():
601697
"""
602698
return _get_config_or_cache_dir(_get_xdg_config_dir())
603699

604-
get_configdir = verbose.wrap('CONFIGDIR=%s', _get_configdir, always=False)
700+
get_configdir = _wrap('CONFIGDIR=%s', _get_configdir, always=False)
605701

606702

607703
def _get_cachedir():
@@ -613,7 +709,7 @@ def _get_cachedir():
613709
"""
614710
return _get_config_or_cache_dir(_get_xdg_cache_dir())
615711

616-
get_cachedir = verbose.wrap('CACHEDIR=%s', _get_cachedir, always=False)
712+
get_cachedir = _wrap('CACHEDIR=%s', _get_cachedir, always=False)
617713

618714

619715
def _decode_filesystem_path(path):
@@ -671,8 +767,8 @@ def _get_data_path_cached():
671767
defaultParams['datapath'][0] = _get_data_path()
672768
return defaultParams['datapath'][0]
673769

674-
get_data_path = verbose.wrap('matplotlib data path %s', _get_data_path_cached,
675-
always=False)
770+
get_data_path = _wrap('matplotlib data path %s', _get_data_path_cached,
771+
always=False)
676772

677773

678774
def get_py2exe_datafiles():
@@ -1035,22 +1131,18 @@ def rc_params_from_file(fname, fail_on_error=False, use_default_template=True):
10351131
if key not in _all_deprecated])
10361132
config.update(config_from_file)
10371133

1038-
verbose.set_level(config['verbose.level'])
1039-
verbose.set_fileo(config['verbose.fileo'])
1040-
10411134
if config['datapath'] is None:
10421135
config['datapath'] = get_data_path()
10431136

10441137
if "".join(config['text.latex.preamble']):
1045-
verbose.report("""
1138+
_log.info("""
10461139
*****************************************************************
10471140
You have the following UNSUPPORTED LaTeX preamble customizations:
10481141
%s
10491142
Please do not ask for support with these customizations active.
10501143
*****************************************************************
1051-
""" % '\n'.join(config['text.latex.preamble']), 'helpful')
1052-
1053-
verbose.report('loaded rc file %s' % fname)
1144+
""", '\n'.join(config['text.latex.preamble']))
1145+
_log.info('loaded rc file %s', fname)
10541146

10551147
return config
10561148

@@ -1736,9 +1828,7 @@ def inner(ax, *args, **kwargs):
17361828
return inner
17371829
return param
17381830

1739-
1740-
verbose.report('matplotlib version %s' % __version__)
1741-
verbose.report('verbose.level %s' % verbose.level)
1742-
verbose.report('interactive is %s' % is_interactive())
1743-
verbose.report('platform is %s' % sys.platform)
1744-
verbose.report('loaded modules: %s' % list(sys.modules), 'debug')
1831+
_log.info('matplotlib version %s', __version__)
1832+
_log.info('interactive is %s', is_interactive())
1833+
_log.info('platform is %s', sys.platform)
1834+
_log.debug('loaded modules: %s', list(sys.modules))

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