QGIS 3.12.3-启动Python错误：无法加载SIP模块

Question

打开软件时，出现如下所示的错误消息。关闭弹出窗口后，该软件可以启动，但不能使用python插件或功能。

无法加载SIP模块。 Python支持将被禁用。

Traceback (most recent call last):
  File "", line 1, in 
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\__init__.py", line 70, in 
    from qgis.PyQt import QtCore
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\PyQt\QtCore.py", line 24, in 
    from PyQt5.QtCore import *
ImportError: DLL load failed: The specified module could not be found.

Python版本：3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)]

QGIS版本：3.12.3-București 'București', 8234261527

Python路径：

['C:\\Users\\(user)\\AppData\\Roaming\\Python\\Python37\\site-packages\\PyQt5',
'C:/OSGEO4~1/apps/qgis/./python', 
'C:/Users/(user)/AppData/Roaming/QGIS/QGIS3\\profiles\\default/python', 
'C:/Users/(user)/AppData/Roaming/QGIS/QGIS3\\profiles\\default/python/plugins', 
'C:/OSGEO4~1/apps/qgis/./python/plugins', 
'C:\\OSGEO4~1\\apps\\Python37', 
'C:\\OSGEO4~1\\apps\\Python37\\Scripts', 
'C:\\OSGeo4W64\\bin\\python37.zip', 
'C:\\OSGEO4~1\\apps\\Python37\\DLLs', 
'C:\\OSGEO4~1\\apps\\Python37\\lib', 
'C:\\OSGeo4W64\\bin', 
'C:\\Users\\(user)\\AppData\\Roaming\\Python\\Python37\\site-packages', 
'C:\\OSGEO4~1\\apps\\Python37\\lib\\site-packages', 
'C:\\OSGEO4~1\\apps\\Python37\\lib\\site-packages\\win32', 
'C:\\OSGEO4~1\\apps\\Python37\\lib\\site-packages\\win32\\lib', 
'C:\\OSGEO4~1\\apps\\Python37\\lib\\site-packages\\Pythonwin']