更新pip
pip3 install --upgrade pip
安装requests
pip3 install requests -i https://pypi.doubanio.com/simple
安装路径： /usr/local/lib/python3.6/site-packages
安装paho-mqtt
pip3 install paho-mqtt -i https://pypi.doubanio.com/simple
安装路径： /usr/local/lib/python3.6/site-packages
安装pillow
pip3 install pillow -i https://pypi.doubanio.com/simple
安装路径： /usr/local/lib64/python3.6/site-packages
