Importerror: No module named matplotlib. pyplot

Sklearn's website does not go. Prepare to compile the documents on GitHub:

$ cd scikit-learn-master/doc$ make html

The following error occurs:

Exception occurred:  File "/home/sunlt/Downloads/scikit-learn-master/doc/sphinxext/gen_rst.py", line 850, in generate_file_rst    import matplotlib.pyplot as pltImportError: No module named matplotlib.pyplotThe full traceback has been saved in /tmp/sphinx-err-7pCJ3k.log, if you want to report the issue to the developers.

Install with PIP:

$ sudo pip install matplotlib

Still this error,

Run the following command to install the SDK:

$ sudo apt-get install python-matplotlib

Importerror: No module named matplotlib. pyplot