plotting.py:144: RuntimeWarning: More than 20 figures have been opened.

[ghost]

Hi,
When I use plot to draw efficient frontier and covariance charts and set a file name to save the results, after saving some images it raises this warning.
I try to correct this by adding the line
plt.cla()
after the
plt.savefig(fname=filename, dpi=dpi)
but it does'nt work.
Also I try to close the plt but could not.

Screenshots
/lib/python3.7/site-packages/pyportfolioopt-1.2.2-py3.7.egg/pypfopt/plotting.py:144: RuntimeWarning: More than 20 figures have been opened. Figures created through the pyplot interface (matplotlib.pyplot.figure) are retained until explicitly closed and may consume too much memory. (To control this warning, see the rcParam figure.max_open_warning).

Thanx for your help
Best Regards
Barmak

[robertmartin8]

Hi Barmak,

Thanks is a common problem with matplotlib. Could you try plt.close("all")? Failing that, perhaps some of the suggestions in this SO post might help.

Best,
Robert

[ghost]

Thank you.
I try that before and it works. But in case of using with simultaneous user it may cause problem.
I want to close only the plot handle of the current session user. But It could be ignore.
Many thanks
& Regards
Barmak

[robertmartin8]

I think plt.close() just closes the latest figure, so you could run that after each generating each plot.