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"body": "<div id=\"comment:0\"></div>\n\nWhen running Sage doctests for the very first time (with an empty `DOT_SAGE` directory):\n\n```\nsage -t --long src/sage/geometry/fan.py\n**********************************************************************\nFile \"src/sage/geometry/fan.py\", line 2887, in sage.geometry.fan.?.plot\nFailed example:\n fan.plot()\nExpected:\n Graphics object consisting of 31 graphics primitives\nGot:\n doctest:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.\n Graphics object consisting of 31 graphics primitives\n**********************************************************************\n1 item had failures:\n 1 of 3 in sage.geometry.fan.?.plot\n [492 tests, 1 failure, 9.60 s]\nsage -t --long src/sage/categories/coxeter_groups.py\n**********************************************************************\nFile \"src/sage/categories/coxeter_groups.py\", line 1681, in sage.categories.coxeter_groups.CoxeterGroups.ElementMethods.bruhat_lower_cov\ners\nFailed example:\n P.show()\nExpected nothing\nGot:\n doctest:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.\n**********************************************************************\n1 item had failures:\n 1 of 15 in sage.categories.coxeter_groups.CoxeterGroups.ElementMethods.bruhat_lower_covers\n [461 tests, 1 failure, 18.31 s]\n```\n\nOf course, the failures go away when the tests are rerun. Any way we can avoid these failures?\n\nCC: @jdemeyer @embray @nthiery\n\nComponent: **build**\n\nAuthor: **Jeroen Demeyer**\n\nBranch: **[`7169df8`](https://github.com/sagemath/sagetrac-mirror/commit/7169df8578eeb59a0de4b649a632f3db2b7c0a4a)**\n\nReviewer: **Erik Bray, Julian R\u00fcth**\n\n_Issue created by migration from https://trac.sagemath.org/ticket/20222_\n\n",
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"title": "One-off doctest failures in a fresh install because of matplotlib",
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sage -t --long src/sage/geometry/fan.py
**********************************************************************
File "src/sage/geometry/fan.py", line 2887, in sage.geometry.fan.?.plot
Failed example:
fan.plot()
Expected:
Graphics object consisting of 31 graphics primitives
Got:
doctest:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
Graphics object consisting of 31 graphics primitives
**********************************************************************
1 item had failures:
1 of 3 in sage.geometry.fan.?.plot
[492 tests, 1 failure, 9.60 s]
sage -t --long src/sage/categories/coxeter_groups.py
**********************************************************************
File "src/sage/categories/coxeter_groups.py", line 1681, in sage.categories.coxeter_groups.CoxeterGroups.ElementMethods.bruhat_lower_cov
ers
Failed example:
P.show()
Expected nothing
Got:
doctest:273: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
**********************************************************************
1 item had failures:
1 of 15 in sage.categories.coxeter_groups.CoxeterGroups.ElementMethods.bruhat_lower_covers
[461 tests, 1 failure, 18.31 s]
Of course, the failures go away when the tests are rerun. Any way we can avoid these failures?
CC: @jdemeyer @embray @nthiery
Component: build
Author: Jeroen Demeyer
Branch: 7169df8
Reviewer: Erik Bray, Julian Rüth
Issue created by migration from https://trac.sagemath.org/ticket/20222
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"body": "<div id=\"comment:1\" align=\"right\">comment:1</div>\n\nRunning tests inside a fresh docker container could be a good way to check for problems like this.",
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Running tests inside a fresh docker container could be a good way to check for problems like this.
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Still don't have automated builds of the sagemath-develop container running yet, but hope to have that sooner or later.
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"body": "<div id=\"comment:4\" align=\"right\">comment:4</div>\n\nCan't we simply ignore these warnings?",
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Can't we simply ignore these warnings?
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Replying to @jdemeyer:
Can't we simply ignore these warnings?
What's the standard way to ignore warnings in doctests, again?
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I wonder if the initial sage startup shouldn't also take care of this.
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Replying to @embray:
I wonder if the initial sage startup shouldn't also take care of this.
That's not really possible because the relevant matplotlib files are user files (inside $DOT_SAGE, which is typically in $HOME), not system files.
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I think I see what you're saying--I'm so used at this point to running my own copy of sage that it's warped my viewpoint in ugly ways :)
But isn't there some initial creation of user files in $DOT_SAGE the first time a user runs Sage? That's what I meant.
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Upstream issue: matplotlib/matplotlib#5836
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Huh, I thought this was already fixed. I haven't run into it in a while.
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"body": "<div id=\"comment:14\" align=\"right\">comment:14</div>\n\n\n```\nsage -t --long --warn-long 81.6 src/sage/tests/startup.py\n**********************************************************************\nFile \"src/sage/tests/startup.py\", line 6, in sage.tests.startup\nFailed example:\n 'numpy' in sys.modules\nExpected:\n False\nGot:\n True\n**********************************************************************\nFile \"src/sage/tests/startup.py\", line 8, in sage.tests.startup\nFailed example:\n 'pyparsing' in sys.modules\nExpected:\n False\nGot:\n True\n**********************************************************************\n1 item had failures:\n 2 of 7 in sage.tests.startup\n [6 tests, 2 failures, 1.47 s]\n```",
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sage -t --long --warn-long 81.6 src/sage/tests/startup.py
**********************************************************************
File "src/sage/tests/startup.py", line 6, in sage.tests.startup
Failed example:
'numpy' in sys.modules
Expected:
False
Got:
True
**********************************************************************
File "src/sage/tests/startup.py", line 8, in sage.tests.startup
Failed example:
'pyparsing' in sys.modules
Expected:
False
Got:
True
**********************************************************************
1 item had failures:
2 of 7 in sage.tests.startup
[6 tests, 2 failures, 1.47 s]
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New version which imports matplotlib in a forked child process.
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"body": "Description changed:\n``````diff\n--- \n+++ \n@@ -1,4 +1,4 @@\n-I'm getting some irrelevant doctests failures (on branch develop), due to some Matplotlib first time artifacts.\n+When running Sage doctests for the very first time (with an empty `DOT_SAGE` directory):\n \n ```\n sage -t --long src/sage/geometry/fan.py\n``````\n",
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---
+++
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-I'm getting some irrelevant doctests failures (on branch develop), due to some Matplotlib first time artifacts.
+When running Sage doctests for the very first time (with an empty `DOT_SAGE` directory):
```
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I'm seeing these failures again in 8.3.beta1.
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See #25375 for a followup ticket.