Warning treated as error while generating docs #8145
Description
Bug report
Bug summary
I get the following WARNING while generating docs.
Warning, treated as error:
/home/aashil/github/matplotlib/doc/api/_as_gen/matplotlib.axes.Axes.clabel.rst:83: WARNING: Exception occurred in plotting contour_demo
from /home/aashil/github/matplotlib/doc/mpl_examples/pylab_examples/contour_demo.py:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.0+3486.g8c57dae-py2.7-linux-x86_64.egg/matplotlib/sphinxext/plot_directive.py", line 525, in run_code
six.exec_(code, ns)
File "/usr/local/lib/python2.7/dist-packages/six.py", line 699, in exec_
exec("""exec _code_ in _globs_, _locs_""")
File "<string>", line 1, in <module>
File "<string>", line 55, in <module>
File "/usr/local/lib/python2.7/dist-packages/matplotlib-2.0.0+3486.g8c57dae-py2.7-linux-x86_64.egg/matplotlib/__init__.py", line 916, in __setitem__
raise ValueError("Key %s: %s" % (key, str(ve)))
ValueError: Key contour.negative_linestyle: linestyle must be a string or an even-length sequence of floats.
Building HTML failed.
The command from contour_demo.py which throws the warning is:
CS = plt.contour(Z, levels,
origin='lower',
linewidths=2,
extent=(-3, 3, -2, 2))
I think it's expecting positive values for extent.
Code for reproduction
- A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required
python make.py htmlMatplotlib version
- Matplotlib version 2.0.0+3486.g8c57dae, Python version 2.7.12 and Platform (Ubuntu 16.04)
- I built Matplotlib from sources and python came pre-installed with Ubuntu 16.04