下载两个 .whl文件到本地，
shiboken2-5.13.2-5.13.2-cp35.cp36.cp37-abi3-manylinux1_x86_64.whl
PySide2-5.13.2-5.13.2-cp35.cp36.cp37-abi3-manylinux1_x86_64.whl
然后依次
pip install Downloads/shiboken2-5.13.2-5.13.2-cp35.cp36.cp37-abi3-manylinux1_x86_64.whl
pip install Downloads/PySide2-5.13.2-5.13.2-cp35.cp36.cp37-abi3-manylinux1_x86_64.whl
安装成功！
再添加QT_QPA_PLATFORM_PLUGIN_PATH环境变量，否则会遇到"qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found."错误
环境变量添加方法：在.bashrc 中添加
export QT_QPA_PLATFORM_PLUGIN_PATH="/home/xxx/anaconda3/lib/python3.7/site-packages/PySide2/Qt/plugins/platforms"
