PyQt5: NameError: 'QtWidget' is not defined

Question

Moving Flask app from local environment to Ubuntu 14.04. Getting 'NameError: 'QtWidgets' is not defined"

Have done the following:

sudo apt-get install python3-pyqt5

verified this with following command:

apt-cache policy python3-pyqt5

        result: "python3-pyqt5:  
                    Installed: 5.2.1+dfsg-1ubuntu1  
                    Candidate: 5.2.1+dfsg-1ubuntu1  
                    Version table:  
                  ***5.2.1+dfsg-1ubuntu1 0  
                        500 http://mirrors.digitalocean.com/ubuntu/ trusty/main amd64 Packages"

tried following command from python command line:

from PyQt5 import QtWidgets

got following response:

ImportError: No module named 'PyQt5'

I'll admit to being relatively new to this, so it's probably something obvious to experienced folks. In any event thanks for any insights you can offer.

If you do `python3 -c "from PyQt5 import QtWidgets"`, do you get the same? What does `which python3` say? — The Compiler, Nov 03 '16 at 20:43

Sergiy Kolodyazhnyy · Answer 1 · 2016-11-03T19:53:11.760

2

Indeed it is something simple: QtWidgets , i.e. non-singular

>>> from PyQt5.GUI import QtWidget
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named 'PyQt5.GUI'
>>> from PyQt5 import QtWidgets
>>>

Also, ensure that you're calling correct interpreter. You've installed PyQt5 for Python3, so use python3:

$ python
Python 2.7.12 (default, Jul  1 2016, 15:12:24) 
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt5 import QtWidgets
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named PyQt5
>>> 

$ python3
Python 3.5.2 (default, Sep 10 2016, 08:21:44) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from PyQt5 import QtWidgets
>>>

edited Nov 03 '16 at 19:53

answered Nov 03 '16 at 17:20

Sergiy Kolodyazhnyy

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Thanks for the response. Turns out I do use QtWidgets (plural); I errored in my question write-up. Net-Net: I still have the problem. I'll edit the question to fix the issue you pointed out. Thanks again. – psanc Nov 03 '16 at 18:49
@psanc See my edit. Here's my suggestion: go back and review basics. Don't jump to GUI programming too fast. Train your attention to key details. – Sergiy Kolodyazhnyy Nov 03 '16 at 19:54
Yes, agree that it's good to go back and review basics (especially given my experience level). I've double checked and am using the correct interpreter: Python 3.4.3 – psanc Nov 03 '16 at 20:10

PyQt5: NameError: 'QtWidget' is not defined

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