sudo sed -i 's/deb.debian.org/mirrors.aliyun.com/g' /etc/apt/sources.list
sudo sed -i 's/deb.debian.org/mirrors.163.com/g' /etc/apt/sources.list
sudo sed -i 's/deb.debian.org/mirrors.huaweicloud.com/g' /etc/apt/sources.list
sudo sed -i 's/deb.debian.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list
deb http://ftp.cn.debian.org/debian stable main non-free contrib
deb http://ftp.cn.debian.org/debian stable-proposed-updates main contrib non-free
deb http://ftp.cn.debian.org/debian-security stable/updates main contrib non-free
deb-src http://ftp.cn.debian.org/debian/stable main contrib non-free
sudo nano /etc/apt/sources.list
ln -s /usr/local/bin/python3.5.2 /usr/bin/python
/home/android/Python-3.5.2
cd Python-3.5.2 ./configure --enable-optimizations
python3.7 --version
ln -s /home/android/Python-3.5.2 /usr/bin/python
sudo ln -s /usr/local/bin/pip3.7 /usr/bin/pip
python -V
移除目录：rm -r /usr/bin/python
/home/android# /usr/bin/python3
ln -s /home/android# /usr/bin/python3.7.3 /usr/bin/python
