centos

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yum install -y openssl openssl-devel zlib-devel zlib

debian

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apt-get install -y zlibc zlib1g-dev openssl libssl-dev gcc g++ libffi-dev libsqlite3-dev

下载python3源码并解压，进入到解压的目录

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wget https://www.python.org/ftp/python/3.8.1/Python-3.8.1.tgz
tar xzf Python-3.8.1.tgz && cd Python-3.8.1

./configure --prefix=/usr/local/python3  --enable-optimizations --enable-loadable-sqlite-extensions

接着编译安装

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make && make install

或用两个线程编译可以使用

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make -j2 &&make install -j2

在/etc/profile配置环境变量

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#Python3
PATH=$PATH:/usr/local/python3/bin
export PATH

使环境变量生效 source /etc/profile