Import pyqt file: ValueError: source code string cannot contain null bytes

Question

I've generated (pyuic5) ui_mainwindow.py file from .ui file made in Qt Designer:

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        ....

I try to import class Ui_MainWindow in my main.py from ui_mainwindow.py:

from ui_mainwindow import Ui_MainWindow

and I'm getting this error:

ValueError: source code string cannot contain null bytes

What have I done wrong?

I recode ui_mainwindow.py from UCS-2 to UTF-8 and it works. Why pyuic5 encode files in USC-2? — sergzemsk
– sergzemsk, Commented May 10, 2020 at 12:55

Rindert · Accepted Answer · 2020-10-09 11:15:24Z

2

The error is due to different ascii coding of the source Load the ui_mainwindow.py in an editor like notepad++ change the encoding to UTF-8 and save the file.

answered Oct 9, 2020 at 11:15

Rindert

212 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Florin · Accepted Answer · 2022-04-19 13:33:53Z

2

Probably you used 'pyside2-uic' in terminal to generate ui_mainwindow.py code, command which created a file with different encoding type than UTF-8.

I suggest to copy that code, create a new .py file and paste your code in that file, that should work.

And if you use Qt Designer to create your interface, you have option to get python code from Form -> View Python Code. This way you avoid using the terminal to generate the code.

edited Apr 19, 2022 at 13:33

answered Feb 2, 2022 at 18:32

Florin

514 bronze badges

Collectives™ on Stack Overflow

Import pyqt file: ValueError: source code string cannot contain null bytes

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related