Opened 21 months ago
Closed 20 months ago
#24918 closed defect (fixed)
Failing doctest in test_jupyter.rst when running patchbot
Reported by:  rws  Owned by:  

Priority:  blocker  Milestone:  sage8.2 
Component:  interact  Keywords:  
Cc:  Merged in:  
Authors:  Ralf Stephan  Reviewers:  Erik Bray 
Report Upstream:  N/A  Work issues:  
Branch:  80d61a0 (Commits)  Commit:  80d61a074638180f1c95693208c9aff2857c9d2f 
Dependencies:  Stopgaps: 
Description
With 8.2.beta7 all patchbots fail with:
File "src/sage/interacts/test_jupyter.rst", line 288, in sage.interacts.test_jupyter Failed example: test(interacts.statistics.coin) Expected: Interactive function <function coin at ...> with 2 widgets n: IntSlider(value=1000, description=u'Number of Tosses', max=10000, min=2, step=100) interval: IntRangeSlider(value=(0, 0), description=u'Plotting range (y)', max=1) doctest:...: UserWarning: Attempting to set identical bottom==top results in singular transformations; automatically expanding. bottom=0.0, top=0.0 Got: doctest:warning File "/home/vdelecro/sage_patchbot/src/bin/sageruntests", line 127, in <module> err = DC.run() File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/control.py", line 1163, in run self.run_doctests() File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/control.py", line 891, in run_doctests self.dispatcher.dispatch() File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 1835, in dispatch self.parallel_dispatch() File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 1732, in parallel_dispatch w.start() # This might take some time File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 2001, in start super(DocTestWorker, self).start() File "/home/vdelecro/sage_patchbot/local/lib/python2.7/multiprocessing/process.py", line 130, in start self._popen = Popen(self) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/multiprocessing/forking.py", line 126, in __init__ code = process_obj._bootstrap() File "/home/vdelecro/sage_patchbot/local/lib/python2.7/multiprocessing/process.py", line 267, in _bootstrap self.run() File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 1974, in run task(self.options, self.outtmpfile, msgpipe, self.result_queue) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 2291, in __call__ result = runner.run(test) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 721, in run return self._run(test, compileflags, out) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 537, in _run self.compile_and_execute(example, compiler, test.globs) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/doctest/forker.py", line 947, in compile_and_execute exec(compiled, globs) File "<doctest sage.interacts.test_jupyter[27]>", line 1, in <module> test(interacts.statistics.coin) File "<doctest sage.interacts.test_jupyter[3]>", line 6, in test return f(**kwargs) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/interacts/library.py", line 736, in coin show(point(c[1:], gridlines=[None, [0.5]], pointsize=1), ymin=interval[0], ymax=interval[1]) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/repl/rich_output/pretty_print.py", line 258, in show pretty_print(*args, **kwds) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/repl/rich_output/pretty_print.py", line 229, in pretty_print dm.display_immediately(*args, **kwds) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/repl/rich_output/display_manager.py", line 833, in display_immediately plain_text, rich_output = self._rich_output_formatter(obj, rich_repr_kwds) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/repl/rich_output/display_manager.py", line 623, in _rich_output_formatter rich_output = self._call_rich_repr(obj, rich_repr_kwds) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/repl/rich_output/display_manager.py", line 581, in _call_rich_repr return obj._rich_repr_(self, **rich_repr_kwds) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/plot/graphics.py", line 884, in _rich_repr_ self.save, kwds, file_ext, output_container) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/repl/rich_output/display_manager.py", line 711, in graphics_from_save save_function(filename, **kwds) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/misc/decorators.py", line 483, in wrapper return func(*args, **kwds) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/plot/graphics.py", line 3153, in save figure = self.matplotlib(**options) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/sage/plot/graphics.py", line 2680, in matplotlib subplot.set_ylim([ymin, ymax]) File "/home/vdelecro/sage_patchbot/local/lib/python2.7/sitepackages/matplotlib/axes/_base.py", line 3239, in set_ylim 'bottom=%s, top=%s') % (bottom, top)) : UserWarning: Attempting to set identical bottom==top results in singular transformations; automatically expanding. bottom=0.0, top=0.0 Interactive function <function coin at 0x7fc26c78baa0> with 2 widgets n: IntSlider(value=1000, description=u'Number of Tosses', max=10000, min=2, step=100) interval: IntRangeSlider(value=(0, 0), description=u'Plotting range (y)', max=1)
Change History (28)
comment:1 followup: ↓ 5 Changed 21 months ago by
comment:2 Changed 21 months ago by
Can the output of warnings (presumably from matplotlib?) be silenced in these tests? They don't seem to add anything.
comment:3 Changed 21 months ago by
 Branch set to u/rws/failing_doctest_in_test_jupyter_rst_when_running_patchbot
comment:4 Changed 21 months ago by
 Commit set to 12a6c823cb0e834d933542b37023c0aa2d076e7b
 Status changed from new to needs_review
comment:5 in reply to: ↑ 1 Changed 21 months ago by
comment:6 Changed 21 months ago by
I agreethe warning is from matplotlib and not really at all interesting for the purposes of these docs.
comment:7 followups: ↓ 8 ↓ 9 Changed 21 months ago by
Having warnings go to sys.stderr
makes sense, but it is a problem when it comes to unpredictable interleaving of stdout and stderr. I could suggest that when running the doctests all warnings just go to stdout, but really this is a general problem for any test that looked at interleaved output on stdout and stderr. I'm not really sure why it just came up in this case.
comment:8 in reply to: ↑ 7 Changed 21 months ago by
Replying to embray:
Having warnings go to
sys.stderr
makes sense, but it is a problem when it comes to unpredictable interleaving of stdout and stderr.
I agree, but that does not explain why it fails only on the patchbot.
comment:9 in reply to: ↑ 7 Changed 21 months ago by
Replying to embray:
Having warnings go to
sys.stderr
makes sense, but it is a problem when it comes to unpredictable interleaving of stdout and stderr.
In principle this is also the case with #24920. If one could just switch off stderr for those tests the linking of a system readline would not be necessary to make those tests pass.
comment:10 Changed 21 months ago by
The patchbot runner simply runs ./sage t
using os.system
, so on its own that shouldn't make a difference.
However, I was able to make this fail consistently by running sp.Popen(['./sage', 't', 'src/sage/interacts/test_jupyter.rst'], stdout=sp.PIPE)
(where sp
is the subprocess
module).
So it might just be some difference, when the patchbot itself is run, in type of file stdout and/or stderr, whether or not those files are buffered, and the size of the buffer.
comment:11 Changed 21 months ago by
Even more simply, I can reproduce just by running ./sage t src/sage/interacts/test_jupyter.rst > test.txt
, for example.
comment:12 Changed 21 months ago by
The test:
sage: test(interacts.statistics.coin) ... Interactive function <function coin at ...> with 2 widgets n: IntSlider(value=1000, description=u'Number of Tosses', max=10000, min=2, step=100) interval: IntRangeSlider(value=(0, 0), description=u'Plotting range (y)', max=1) ...
The test run:
Failed example: test(interacts.statistics.coin) Expected: Interactive function <function coin at ...> with 2 widgets n: IntSlider(value=1000, description=u'Number of Tosses', max=10000, min=2 , step=100) interval: IntRangeSlider(value=(0, 0), description=u'Plotting range (y)', max=1) ...
It appears that ellipsis at the start of the output part of the doctest is ignored, is this a feature? If not immediately fixable I propose to "known bug" this doctest for now.
comment:13 Changed 21 months ago by
It does make more sense that the warning should come first in the output. But whether or not it actually does come first depends on I/O buffering peculiarities it seems.
comment:14 followup: ↓ 15 Changed 21 months ago by
One simple workaround would be to flush stdout before printing the warning. That's literally a 1line fix.
comment:15 in reply to: ↑ 14 Changed 21 months ago by
Replying to jdemeyer:
One simple workaround would be to flush stdout before printing the warning. That's literally a 1line fix.
In matplotlib/axes/_base.py
, so that's a matplotlib patch I guess.
comment:16 Changed 21 months ago by
No, I meant in the doctest framework whenever a warning is printed.
comment:17 Changed 21 months ago by
I mean this change:

src/sage/doctest/forker.py
diff git a/src/sage/doctest/forker.py b/src/sage/doctest/forker.py index 301383b..38c5cdf 100644
a b def showwarning_with_traceback(message, category, filename, lineno, file=None, l 170 170 : 171 171 UserWarning: bad stuff 172 172 """ 173 # Flush stdout to get predictable ordering of output and warnings 174 sys.stdout.flush() 175 173 176 # Get traceback to display in warning 174 177 tb = traceback.extract_stack() 175 178 tb = tb[:1] # Drop this stack frame for showwarning_with_traceback()
comment:18 Changed 21 months ago by
 Commit changed from 12a6c823cb0e834d933542b37023c0aa2d076e7b to 857cb1503792426588ca8fd623439cd85f317d96
Branch pushed to git repo; I updated commit sha1. New commits:
857cb15  24918: apply suggested workaround

comment:19 Changed 21 months ago by
Yes, that makes total sense. I was just experimenting with a different approach that reopens sys.stdout
and sys.stderr
with unbuffered files, but this should be simpler.
New commits:
857cb15  24918: apply suggested workaround

comment:20 Changed 21 months ago by
OK, thanks.
comment:21 Changed 21 months ago by
Looks like this works, though in this case you can also just remove the original fix, since now the stdout does appear before the stderr as before (I'm actually not sure why that's the caseI would think the warning would be displayed firstbut apparently not).
comment:22 Changed 21 months ago by
 Status changed from needs_review to needs_work
comment:23 Changed 21 months ago by
 Branch changed from u/rws/failing_doctest_in_test_jupyter_rst_when_running_patchbot to u/rws/24918
comment:24 Changed 21 months ago by
 Commit changed from 857cb1503792426588ca8fd623439cd85f317d96 to 80d61a074638180f1c95693208c9aff2857c9d2f
 Status changed from needs_work to needs_review
New commits:
80d61a0  24918: force ordered output in doctests

comment:25 Changed 21 months ago by
 Status changed from needs_review to positive_review
comment:26 Changed 21 months ago by
 Reviewers set to Erik Bray
comment:27 Changed 21 months ago by
Thanks.
comment:28 Changed 20 months ago by
 Branch changed from u/rws/24918 to 80d61a074638180f1c95693208c9aff2857c9d2f
 Resolution set to fixed
 Status changed from positive_review to closed
The parts with "Interactive function" and "doctest" are reversed, and in "doctest" a backtrace is inserted. Race condition?