无法加载SIP模块。Python支持将被禁用。

Question

我用Lubuntu 18.10 64位在我的电脑上安装了QGIS版本3.6。我有python 3.6.7和QT5.11.1。

一旦我运行QGIS，就会得到这个错误。

 Couldn't load SIP module. Python support will be disabled.


    Traceback (most recent call last):   File "", line 1, in    File "/usr/lib/python3/dist-packages/qgis/__init__.py", line 72, in 
        from qgis.PyQt import QtCore   File "/usr/lib/python3/dist-packages/qgis/PyQt/QtCore.py", line 26, in 
        from PyQt5.QtCore import * ImportError: /home/giacomo/.local/lib/python3.6/site-packages/PyQt5/QtCore.so: symbol _ZN23QOperatingSystemVersion11MacOSMojaveE version Qt_5 not defined in file libQt5Core.so.5 with link time reference


    Python version:
    3.6.7 (default, Oct 22 2018, 11:32:17)  [GCC 8.2.0]

    QGIS version:
    3.6.1-Noosa 'Noosa', 93e761d

    Python path: ['/usr/share/qgis/python', '/home/giacomo/.local/share/QGIS/QGIS3/profiles/default/python', '/home/giacomo/.local/share/QGIS/QGIS3/profiles/default/python/plugins', '/usr/share/qgis/python/plugins', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/giacomo/.local/lib/python3.6/site-packages', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages']

如何安装与我的软件一起运行的SIP版本？

Answer 1

在安装PyQt5之后，我在QGIS 3.4.13的Ubuntu18.04上遇到了这个问题。我没有将它放在虚拟环境中，因为我没有预料到会出现任何问题；它肯定是覆盖了PyQt4和sip的旧版本，因为有一个与PyQt5相关的特殊版本。我能够通过卸载PyQt5 5‘S sip (和PyQt5，可以总是在虚拟环境中正确地重新安装)来解决QGIS的问题，然后在整个sip系统范围内重新安装(在QGIS查找它的环境中)。

在下面的示例中，我确保使用Python3 pip，因为我的系统中有Python2和3。

sudo -H pip3 uninstall PyQt5-sip
sudo -H pip3 uninstall PyQt5

# This seems to be the Python package QGIS requires
sudo -H pip3 install sip