When I installed matplotlib and tried to draw a graph, it got stuck more than I expected, so make a note.

environment

Own machine: Yosemite 10.10.3 python: 2.6.6

error list

--freetype cannot be built when installing --Library ImportError --Runtime Error --The graph closes in an instant (not an error)

1. Pip installation errors and remedies

If you install with pip install matplotlib

=================================================== The following required packages can not be built: freetype Command "python setup.py egg_info" failed with error code 1

And stop with the error. Search, it seems to be a fixed bug now.

For a quick install, enter freetype with brew install freetype as shown in the error message.

Then run pip install matplotlib again and the installation will complete without any problems.

2. Errors and workarounds when importing in code

When I try to import and run matplotlib in my code

ImportError:dlopen(~): Library not loaded: Reason: image not found

And stop with an error. It seems that the dynamic link library cannot be loaded, and when I see the message, it seems that libpng and freetype are not working.

So once pip uninstall matplotlib After doing brew reinstall libpng --universal brew reinstall freetype --universal Install the dll again with.

But again, it stopped with the following error:

Error: The brew link step did not complete successfully The formula built, but is not symlinked into /usr/local Could not symlink share/man/man5/png.5 /usr/local/share/man/man5 is not writable. You can try again using: brew link libpng

It seems that writing is not possible due to permission problems, so refer to here sudo chown -R $(whoami) /usr/local/lib/pkgconfig sudo chown -R $(whoami) /usr/local/share/man/man5 Change the owner with. Do brew link libpng again and succeed. brew reinstall freetype --universal succeeded without any problem. After that, run pip install matplotlib again to resolve the import error.

3. Run-time errors and remedies

You can now import, but when you run it

RuntimeError: Python is not installed as a framework. The Mac OS X backend will not be able to function correctly if Python is not installed as a framework. See the Python documentation for more information on installing Python as a framework on Mac OS X. Please either reinstall Python as a framework, or try one of the other backends.

Stops with the error. The solution is detailed in Post here ~/.matplotlib Create a matplotlibrc file in backend : TkAgg It seems that you can specify a backend other than macosx like this.

With the above, the graph can be drawn at last.

4. Graph drawing ends in an instant

It's not an error, but I was a little addicted to it without knowing it.

import matplotlib.pyplot as plt And if you import, to the part where you want to stop drawing plt.show() It is OK if you write.