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安装时ubuntu提示：
DEPRECATION: Python 3.4 support has been deprecated. pip 19.1 will be the last one
supporting it. Please upgrade your Python as Python 3.4 won't be maintained after March
2019 (cf PEP 429).
所以我们要升级一下版本：
wget https://www.python.org/ftp/python/3.7.3/Python-3.7.3.tar.xz
xz -d Python-3.7.3.tar.xz
tar -xvf Python-3.7.3.tar
cd Python-3.7.3
./configure --with-ssl
sudo make
sudo make install如果不成功，安装依赖再试一下：
sudo apt-get install -y zlib*接着修改软连接
sudo rm -rf /usr/bin/python3
sudo rm -rf /usr/bin/pip3
sudo ln -s /usr/local/python3/bin/python3.7 /usr/bin/python3
sudo ln -s /usr/local/python3/bin/pip3.7 /usr/bin/pip3重启即可