Installing Python 3.8.6 from source on Ubuntu 18.04

# update system

sudo apt update && sudo apt upgrade -y

# install build tools and python prerequisites (这个必须先执行，不然后面有很多坑)

sudo apt install build-essential libssl-dev zlib1g-dev libncurses5-dev libncursesw5-dev libreadline-dev libsqlite3-dev libgdbm-dev libdb5.3-dev libbz2-dev libexpat1-dev liblzma-dev tk-dev libffi-dev

# download Python-3.8.6.tgz

wget https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tgz

# 解压

tar -zxf Python-3.8.6.tgz

# 进入python3.8.6

cd Python-3.8.6

# 编译文件  时间大概有1-3分钟

./configure --prefix=/usr/local/python3

# 编译好后，会有另外一个提示，让run ./configure xxx

./configure --enable-optimizations

# 安装（注意权限，用root）

make && make install

我这边因为原来的unbuntu有python，所以需要将原来的软连接删除，重新创建；

# 备份原先的软链接 

sudo -s mv /usr/bin/python /usr/bin/python.bak 

sudo -s mv /usr/bin/pip /usr/bin/pip.bk 

# 设置新的软链接 ln -s  /usr/local/python3.8/bin/python3.8(每个人不一样) /usr/bin/python 

ln -s /usr/local/python3.8/bin/pip3.8(每个人不一样) /usr/bin/pip

# 查看效果

python -V

pip -V

# 结束

可关注以下链接：

http://events.jianshu.io/p/261e1d52f471

https://gist.github.com/jerblack/798718c1910ccdd4ede92481229043be