这可能是由于PyMuPDF库更新导致的，里面的一些函数名发生了变化
1. AttributeError: 'Document' object has no attribute 'pageCount'
将 pageCount改为 page_count
2. AttributeError: 'Matrix' object has no attribute 'preRotate'
将preRotate改为prerotate
3.AttributeError: 'Page' object has no attribute 'getPixmap'
将getPixmap改为get_pixmap
4. AttributeError: 'Pixmap' object has no attribute 'writePNG'
将writePNG改为_writeIMG
或者直接安装老版本的这个库，也能解决一切问题
pip install PyMuPDF==1.19.0 -i https://pypi.tuna.tsinghua.edu.cn/simple
