Ubuntu 18.04系统内置了Python 3.6和Python 2.7版本，以下是在Ubuntu 18.04系统中安装Python 3.7版本的方法。

执行所有升级

sudo apt update
sudo apt upgrade -y

安装编译Python源程序所需的包

sudo apt install build-essential -y
sudo apt install libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev -y
sudo apt-get install zlib1g-dev

后面的就不截图了，自己根据下面的指令进行操作即可！

下载Python 3.7源程序压缩包

wget https://www.python.org/ftp/python/3.7.1/Python-3.7.1.tgz

解压缩

tar -xzvf Python-3.7.1.tgz

 配置

cd Python-3.7.1
 ./configure --enable-optimizations

编译和安装Python 3.7

sudo make
sudo make install

查看Python版本

python3
Python 3.7.1 (default, Nov 21 2018, 16:35:49) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 

升级pip和更换pip源

sudo pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
pip3 install --upgrade pip