python2切换到python3之后，快速安装依赖
1、导出依赖到requirements.txt
pip freeze > requirement.txt
2、pip升级到pip3
python3 -m pip install --user --upgrade pip
3、pip3根据requirements.txt安装依赖
pip3 install -r requirements.txt
如果pip3 install报错subprocess.CalledProcessError: Command '('lsb_release', '-a')' returned non-zero exit status 1
输入：
sudo mv /usr/bin/lsb_release /usr/bin/lsb_release_bak
解决
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