为python安装matplotlib模块
matplotlib是python中强大的画图模块。
首先确保已经安装python，然后用pip来安装matplotlib模块。
进入到cmd窗口下，执行python -m pip install -U pip setuptools进行升级。
接着键入python -m pip install matplotlib进行自动的安装，系统会自动下载安装包。
安装完成后，可以用python -m pip list查看本机的安装的所有模块，确保matplotlib已经安装成功。
进入到python idle中，运行import matplotlib，如下图所示，如果没有报错提示，那就可以开始使用了。
如何在Windows下开发Python：在cmd下运行Python脚本+如何使用Python Shell（command line模式和GUI模式）+如何使用Python IDE
http://www.crifan.com/how_to_do_python_development_under_windows_environment/
定制marker
Matplotlib custom marker/symbol
2017/3/16
数据：用户0和用户1的位置坐标，冒号后的数字为DBScan聚类之后的簇编号，0表示噪声点
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