Description
Trying to reproduce matplotlib-y errors in #12168, I did pip install --upgrade matplotlib, and now I'm getting the same errors, e.g.:
ERROR: Test color settings for latex_to_png.
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Traceback (most recent call last):
File "/home/itamarst/Devel/ipython/venv/lib64/python3.7/site-packages/nose/case.py", line 198, in runTest
self.test(*self.arg)
File "/home/itamarst/Devel/ipython/IPython/testing/decorators.py", line 212, in skipper_func
return f(*args, **kwargs)
File "/home/itamarst/Devel/ipython/IPython/lib/tests/test_latextools.py", line 144, in test_latex_to_png_color
default_value = latextools.latex_to_png(latex_string, wrap=False)
File "/home/itamarst/Devel/ipython/IPython/lib/latextools.py", line 104, in latex_to_png
bin_data = f(s, wrap, color, scale)
File "/home/itamarst/Devel/ipython/IPython/lib/latextools.py", line 126, in latex_to_png_mpl
mt.to_png(f, s, fontsize=12, dpi=dpi, color=color)
File "/home/itamarst/Devel/ipython/venv/lib64/python3.7/site-packages/matplotlib/mathtext.py", line 3436, in to_png
with open(filename, "wb") as file:
TypeError: expected str, bytes or os.PathLike object, not _io.BytesIO