Ubuntu更新python3.5到最新版本——3.7.4

• 1、下载
  网址：https://www.python.org/ftp/python/3.7.4/ 下载 Python-3.7.4rc1.tgz
  

• 2、解压

  • tar zxvf Python-3.7.1rc2.tgz
  • cd Python-3.7.1rc2

• 3、编译

  • ./configure
  • make
  • sudo make install

当 sudo make install 时：报错ModuleNotFoundError: No module named ‘_ctypes’

• 补全配置
  sudo apt-get update
  sudo apt-get upgrade
  sudo apt-get dist-upgrade
  sudo apt-get install build-essential python-dev python-setuptools python-pip python-smbus
  sudo apt-get install build-essential libncursesw5-dev libgdbm-dev libc6-dev
  sudo apt-get install zlib1g-dev libsqlite3-dev tk-dev
  sudo apt-get install libssl-dev openssl
  sudo apt-get install libffi-dev

• 清理
  sudo apt autoremove

• 4、先找到python3.7解释器位置，一般是 /usr/local/bin/python3.7
  如果不知道，运行以下代码：
  

• 5、删除原来的软连接
  rm -rf /usr/bin/python3
  rm -rf /usr/bin/pip3

• 6、添加python3的软链接
  ln -s /usr/local/bin/python3.7 /usr/bin/python3

• 7、添加 pip3 的软链接
  ln -s /usr/local/bin/pip3.7 /usr/bin/pip3

验证：python3 --version