PyQt5：ImportError：没有名为sip的模块

Question

This has me completely bamboozled. I wanted to compile PyQt5. To do that I first need to compile and install sip. So I compiled and installed sip. Then I compiled and installed PyQt5. No problems so far. Then I tried it out.

$ python
Python 2.7.13 (default, Sep 26 2018, 18:42:22) 
[GCC 6.3.0 20170516] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sip
>>> import PyQt5
>>> from PyQt5 import QtCore
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named sip
>>> 

What??? I had to have sip installed to compile PyQt5. I had to have sip installed to import it. Why is it now telling me that there is "No module named sip?"

Answer 1

I had this problem with system packages (installed via apt), with a virtual env created with --system-site-packages , and I don't have it inside a proper virtual env. Python3.6, LinuxMint 19.

Answer 2

I had this problem when I was inside (venv) running the python from the venv/bin

it cleared and found sip when I used usr/bin/python

(in my setup they were the same versions, please check you product and setup that the virtual py is not needed)