ModuleNotFoundError: No module named 'PySide'

Question

Please help me - I have spent few days reading forums to fix that issue (No success so far).

I still get this error

import PySide.QtCore
ModuleNotFoundError: No module named 'PySide' 

(using Mac OR using my raspberry pi)

Traceback (most recent call last):

File "/Users/macbookair/Documents/Python/Learning Python Chapter Files/chapter4-turtle.py", line 3, in <module>
from PySide.QtCore import *
ModuleNotFoundError: No module named 'PySide'

I have python3 installed. I have installed PySide using several different commands such as

sudo apt-get install python-pyside
sudo apt-get install python3-pyside
sudo apt-get install python3 python3-pyqt5

in the Mac tried

brew install python3  #This worked
brew install qt5 . #This worked - qt 5.9.1 is already installed

Some people say the problem is on the path, so I have tried (I have Python 3.6.1 (v3.6.1:69c0db5050, Mar 21 2017, 01:21:04))

export DYLD_LIBRARY_PATH=/usr/local/lib/python3.6.1/site-packages/PySide

I tried

export PATH=/usr/local/bin:$PATH

export PATH=/usr/local/share/python:$PATH
export PATH=/usr/local/share/python3:$PATH

brew install pyqt
export PYTHONPATH=/usr/local/lib/python:$PYTHONPATH
export PYTHONPATH=/usr/local/lib/python3:$PYTHONPATH

brew install zmq
pip install pyzmq
pip install pygments

This freak error still happen

Answer 1

It looks like you installed pyside only for Python 2. There are two meta packages for pyside in the repository python-pyside and python3-pyside. You can see this for yourself with the following command which searches the repository for pyside:

sudo apt-cache search pyside

You can also confirm that it works in Python 2, by doing the following from the command line:

1. open the python 2 terminal: python
2. try to import the package: import PySide.QtCore

If you don't get an error the package is installed and available for Python 2.

To resolve the issue simply install the Python 3 package:

sudo apt-install python3-pyside

You should now be able to import the package into your code.

I am not a Mac user, but I would be willing to bet the solution is similar.

Answer 2

I found a solution to this problem for python version > 3.4x, which I posted here: https://stackoverflow.com/a/65110892/12298276

Answer 3

Thank you very much Steve Robillard, your answer in the comment is the solution for this problem. Bellow, I will just explain step-by-step How I did, so it might help some beginner like me.

Update before installing python3-pyside . Do it in the order below:

In LXTerminal:

sudo apt-get update

install python3-pyside:

sudo apt-get install python3-pyside

Open Python 3 in the LXTerminal:

python3

"Call" the Pyside:

import PySide

Check the version you have just installed:

PySide.__version__