本文針對是Python3的環境遇到的問題，如果是Python2，卸載以及安裝相應的pyqt4版本，
遇到問題：
第一步：洗掉原有的pyqt
pip uninstall pyqt5
pip uninstall pyqt5-sip第二步：重新安裝pyqt
由于第一次安裝pyqt，出現這個錯誤
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
spyder 5.0.4 requires pyqtwebengine<5.13, which is not installed.
spyder 5.0.4 requires pyqt5<5.13, but you have pyqt5 5.13.0 which is incompatible.
所以需要下載對應版本：
pip install PyQt5-5.12.3-5.12.10-cp35.cp36.cp37.cp38.cp39-none-win_amd64.whl
pip install PyQtWebEngine-5.12.1-5.12.10-cp35.cp36.cp37.cp38.cp39-none-win_amd64.whl
下載鏈接：
https://files.pythonhosted.org/packages/cb/c2/fc1632a893be36b515955c6b8830aabaa4b616c0078e8ad2a5c12465ea6a/PyQt5-5.12.3-5.12.10-cp35.cp36.cp37.cp38.cp39-none-win_amd64.whl
https://files.pythonhosted.org/packages/9b/0e/11413f9efeebbcfec3d44559e98523b3e420c3c99c79784154e79fc35838/PyQtWebEngine-5.12.1-5.12.10-cp35.cp36.cp37.cp38.cp39-none-win_amd64.whl
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標籤：python