PyQt是什么？PyQGIS又是什么？两者之间有什么关系？

PyQt：https://wiki.python.org/moin/PyQt       https://pypi.org/project/PyQt5/ 基于Python的QT显示控件类库

PyQGIS：https://zhuanlan.zhihu.com/p/100320986 基于Python的QGIS类库

 

 https://docs.qgis.org/3.4/en/docs/pyqgis_developer_cookbook/loadproject.html

https://docs.qgis.org/3.16/en/docs/pyqgis_developer_cookbook/loadproject.html

3.17版：https://docs.qgis.org/testing/en/docs/pyqgis_developer_cookbook/loadproject.html