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hapream@hapream-desktop:~$ pip install matplotlib.pyplot
Collecting matplotlib.pyplot
Could not find a version that satisfies the requirement matplotlib.pyplot (from versions: )
No matching distribution found for matplotlib.pyplot
You are using pip version 8.1.1, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

ubuntu安装
sudo apt-get install python-matplotlib

sudo apt-get install python-scipy
sudo apt-get install python-numpy