树莓派centos系统安装python3
树莓派的centos系统不带有python3,虽然自己下载源码编译安装，下面是方法：
1.安装wget
yum -y install wget
2.使用wget命令从官方网站下载python3的源码
wget https://www.python.org/ftp/python/3.5.7/Python-3.5.7.tgz
3.解压
tar -zxvf Python-3.5.7.tgz
4.cd到解压目录，然后运行配置
./configure --prefix=/usr/local/python3 --with-ssl
5.make
6.make install
7.将编译结果中的python可执行文件复制为python3,python3.5(这样可以直接用python3来调用python3,而使用python时默认调用python2.7)
cd /usr/local/python3
cp python python3
cp python python3.5
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源码编译安装的版本不带有pip,下面介绍如何安装pip
从pypi上下面pip压缩包
wget https://files.pythonhosted.org/packages/36/fa/51ca4d57392e2f69397cd6e5af23da2a8d37884a605f9e3f2d3bfdc48397/pip-19.0.3.tar.gz
解压
tar -zxvf pip-19.0.3.tar.gz
cd到解压目录，然后运行
python3 setup.py install
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将/usr/local/python3/bin添加至$PATH
vim /etc/profile
在文件末尾添加 PATH=$PATH:/usr/local/python3/bin:/usr/local/python3
source /etc/profile
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