Python Ubutun更新到 3.5

查看系统中python所在的路径whereis python
eg:

1. cd 到/usr/bin目录下将python备份为python.bak(mv python python.bak)
2. 更改软链接到python3.5 (sudo ln -s /usr/bin/python3.5 /usr/bin/python) -->此时系统python环境为3.5
3. 安装pip
   -sudo apt-get update
   -sudo apt-get install python3-pip(此时的pip仍是2.7版本的pip,若要安装需使用pip3)
4. 为使用pip安装 (pip3 install --upgrade pip)

更新到3.8

1. 下载python3.8资源包wget https://www.python.org/ftp/python/3.8.0/Python-3.8.0a2.tgz
2. 解压资源包tar -xvzf Python-3.8.0a2.tgz
3. 配置资源 ./configure --prefix=/usr/local/python3 (--prefix配置路径)
4. 编译 make
5. 会提示缺少模块，依次安装
   -sudo apt-get update
   -sudo apt-get upgrade
   -sudo apt-get dist-upgrade
   -sudo apt-get install libbz2-dev libncurses5-dev libgdbm-dev libgdbm-compat-dev liblzma-dev libsqlite3-dev libssl-dev openssl tk-dev uuid-dev libreadline-dev
6. 再次配置编译，重复3.4步骤
7. 安装(sudo make install)
8. 配置链接路径(sudo update-alternatives --install /usr/bin/python python /usr/local/python3/bin/python3 1)
   sudo update-alternatives --config pip
9. 配置pip软链接(sudo update-alternatives --install /usr/bin/pip pip /usr/local/python3/bin/pip3 1)
   sudo update-alternatives --config pip

更新3.8 version参考博客链接：https://blog.csdn.net/liuenming123/article/details/88638626