We Keep Coding

Python - PyQt5 [PyQt5.QtWidgets import QApplication 'No Module']

I have been attempting to learn PyQt5 in order to create GUI.
Pip installed the PyQt5 & the PyQt5.tools yet when I attempt to use it
using Visual Studio Code (while having the Python Extension of VS Code installed) I receive an error.
VS Code detects PyQt5 up to PyQt5.QtWidgets, yet it says no module inside QtWidgets named QApplication can be found.
Import Error of VS Code
On the contrary when it comes to the error, when I attempt to import QApplication from python.exe, no errors nor problems are presented.
Python.exe 'from PyQt5.QtWidgets import QApplication'
This leads me into thinking the problem resides at VS Code's doorstep..
Thanks for your time/answers.

open the cmd from start menu (Command Prompt)
type pip install pyqt5
type pip install pyqt5-stubs
install the integration of PyQt5 from VSCode Marketplace
if is it still not working try uninstalling PyQt5 (pip uninstall pyqt5)
and install it again

Search "PYQT Integration" on ur VS Code Extension shop
Install it
Set the configurations (ur pyqtdesigner path and pyuic etc)
this may help u

I had the same problem with lots of modules specially pytube . PyQt6 , It was all resolved when I changed my interpreter to python 3.11

Getting an old python script that needs gtk to work

So I'm trying to fix up an old program and I've been trying to run its main script on my Mac, but it says it can't find module gtk (it says it's a required dependency in the README). I have tried a ton of things to get this script to run, I've installed both python 2 and 3 with brew, installed many versions of pygtk with brew, tried to run the script on my user dir and in a python 2 and 3 virtualenv, added #!/usr/bin/env python2 and added a sys path to where brew installed pygtk, but all to no avail. Neither gtk nor pygtk can seem to be found. My original attempt at using pip to install pygtk resulted in this output:
Complete output from command python setup.py egg_info:
********************************************************************
* Building PyGTK using distutils is only supported on windows. *
* To build PyGTK in a supported way, read the INSTALL file. *
********************************************************************
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in
/private/var/folders/6l/k1kfh5415ln0886zznkffpr80000gn/T/pip-install-
50TCjw/pygtk/
So... my question is: how should I proceed? I'm actually not sure what gtk does. Should I attempt to update this program to python3 compatibility? What is the state of compatibility for gtk? And how can I check if I actually even have gtk on my system? Because homebrew is pretty convinced that I do.
Update:
So I manually used the python2.7 that was installed via brew (in usr/local/Cellar/python#2) and this seemed to fix the gtk problem. However now it can't import webkit module which is somewhere else in the program, and I'm stuck here now...

Finally got all the dependancies loaded. python-webkit was apparently completely deprecated, I had to find the last macOS compatible version of it at https://code.google.com/archive/p/pywebkitgtk/downloads and then it was a simple matter of running its configure file and adding its install location to my Cellar python#2 program's sys path. Now the rest of the program is pretty messed up but I accomplished what I wanted for now

GUI Built with Pynsist and PyQt: Import Error 'sip'

I have built a GUI using PyQt5 and wanted to distribute it to other computers without Python installed by packageing it with pynsist. Unfortunately, when launching the shortcuts produced by the installer, the GUI does not open as expected and Python keeps crashing (even if Python is instlalled).
The console shows the following error upon crashing:
ModuleNotFoundError: No module named 'sip'.
This is due to from PyQt5.QtCore import *.
Unfortunately, when launching the .launch.py script on a computer with Python installed, everything works fine. I suppose this is because it then targets the installed version instead of the version included in the build of the GUI.
However, the shortcuts do not work, no matter if Python is installed, giving me the above error.
Any ideas how to fix this problem and make the shortcuts work on computers that do not have Python installed?
Thank you in advance!

When I first encountered this problem I simply added sip.pyd to my project-folder. You can find it under:
x:/path-to-python/Lib/site-packages/sip.pyd
but what realy solved my problem was using pyinstaller.
It automatically detects most dependencies and most of the time runs without complicated configurations.
pip install pyinstaller
pyinstaller main.py
# done

Sip is a separate package which PyQt5 requires. You can include it with your application by listing it in pypi_wheels=, as in the PyQt5 example:
[Include]
packages=listapp
pypi_wheels= PyQt5==5.6
sip==4.18
If you're using the latest version of PyQt5 (5.10.1), then the latest version of sip (4.19.8) should work with it.

Having issues with PyQt5 installation and importing into python

I am fairly new to python, and am having issues using PyQt5. Basically, i am trying to run the code i got from following this website (QtDesigner and PyQt5 basic tutorial), but am having issues:
https://nikolak.com/pyqt-qt-designer-getting-started/
I am using Python 3.6.1 on Windows with PyQt5. I am aware that the above tutorial uses Python 2 and PyQt4. I don't think that is part of the issue, but I could be wrong.
I try to run the main.py script from the above tutorial, and i get this error:
AttributeError: module 'PyQt5.QtGui' has no attribute 'QMainWindow'
because of line 6 in main.py. I assume that this is because PyQt5 is not properly installed, so I use pip:
pip install pyqt5
but get the following error:
Could not find a version that satisfies the requiremenet pyqt5 (from versions: )
No matching distribution found for pyqt5
I realize that some of the above main.py code will only work for pyqt4, I am just trying to get past the issue of not being able to correctly import PyQt5. Another program, that is made for PyQt5 and python 3.6, is having similar issues. When I try:
from PyQt5.QtWidgets import QMainWindow
I get this error back:
ImportError: cannot import name 'QMainWindow'
I have been trying to fix this issue for a while now, and have not found anything that has helped my situation thus far. Any help would be greatly appreciated, so that I can finally get this thing to work.

Like Dan-Dev mentioned in the comments you should try "pip3 install pyqt5". If pip3 isn't being recognized that likely means it hasn't been added to the path. This link will help you find where your python directory is:
How to install pip3 on Windows?. This link will help you add it to the path:
https://www.java.com/en/download/help/path.xml
In PyQt5 the QMainWindow is part of the QtWidgets library, so the first error you are getting is entirely expected.
I'd recommend you take a look at some PyQt5 examples as the differences are minor but they will continue to trip you up while learning how to use PyQt. Take a look at this:
Is there a tutorial specifically for PyQt5?

Error in using PyQt4 with python 3.5.2 for running a PyMoskito example

I'm trying to get an example of PyMoskito running under Python 3.5.2 Win7 64 bit
This library needs PyQt4 which in turn needs SIP.
1- I installed SIP using pip3 install SIP which ended up successfully (with a notice to update my pip).
2- I even barely know Python. So I tried installing PyQt4 with a binary executable. The binaries provided at riverbankcomputing.com/software/pyqt/download are for python 3.4 so I downloaded an unofficial wheel from http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyqt4 with a name PyQt4-4.11.4-cp35-none-win_amd64.whl. Then I cd'ed into the respective directory and installed it with pip which ended up successfully.
Now, I don't know what is the standard procedure for testing if a library is working. So I ran setup.py from the main directory of library and I assumed it set things up. Then I ran an example from examples folder and I get this error
Traceback (most recent call last):
File "C:\Users\****\Documents\Python Libraries\pymoskito-master\pymoskito-master\examples\ballbeam\main.py", line 3, in <module>
from PyQt4 import QtGui, QtCore
ImportError: DLL load failed: The specified module could not be found.
I assume python could NOT find the PyQt4 dependencies. I searched stackoverflow and non of the solutions worked. Here is what I tried so far:
There is NO /bin directory in C:\Python35\Lib\site-packages\PyQt4. So all dlls are already in the \PyQt4 directory
I added this directory to System PATH env. var. Same error occurs
I appended this directory to sys.path and tested it. Same error occurs
I created a \bin directory and copied all \PyQt4 into it. Then added it to PATH. Same error occurs
After that, I installed python 2.7 and PyQt4 from riverbankcomputing but not SIP. I still have the same problem
I really don't know what else should I do. I'm actually frustrated by all the mentioning of whether OP is using Python 2 or Python 3 or QT4 or QT5 or x86 or x64. I believe backward compatibility should be the minimum of a programming language and this is definitely a mess for Python

The short answer, I believe is that you have pyqt4 (a python interface to the qt4 library), sip (an automated c++-to-python communication library) but not qt4 itself (the UI library). qt4 is it's own monolithic c++ project with its own build and dependency problems.
You may be able to find the various pieces at http://www.lfd.uci.edu/~gohlke , but I would recommend installing the Anaconda distribution of python ( https://www.continuum.io/downloads ), which provides binary packages for things like qt4 and pyqtgraph, the former of which is installed by default, the latter requiring a command like
conda install pyqtgraph
After this, pip install of pymoskito should work.
There is also mention in the readme of vtk, but it is not in the requirememnts. vtk is also a monolithic c++ library and hard to build, but conda has that too, albeit not in the default channel for py35:
conda install vtk -c menpo