PyQt bug with QLIneEdit

Question

When QLineEdit() is used in text it appears to create a bug in lists and dictionaries,this code works:

from PyQt5.QtWidgets import *
a=[1,2]
b=a[0]
print(b)

but when a line edit is added python will crash

from PyQt5.QtWidgets import *
c=QLineEdit()
a=[1,2]
b=a[0]
print(b)

I have found this when using the Anaconda package on multiple computers, can anyone suggest a work around which does not involve not using lists or dictionaries.

Do you get error message ? Always add full error message (traceback) in question. — furas
– furas, Commented Oct 31, 2016 at 20:37
Please read the guidance on providing a minimal reproducible example. — ekhumoro
– ekhumoro, Commented Oct 31, 2016 at 22:24

furas · Accepted Answer · 2016-10-31 21:23:54Z

0

You use it in wrong way. First you have to use QApplication(sys.argv) which initiates all needed modules and librares.

from PyQt5.QtWidgets import *
import sys

app = QApplication(sys.argv)

c = QLineEdit()
a = [1,2]
b = a[0]
print(b)

So find some PyQt5 tutorial.

EDIT: problem is not list or dictionary but QListEdit (or any other Widget) without QApplication

You get the same problem in

from PyQt5.QtWidgets import *
QLineEdit()

or

from PyQt5.QtWidgets import *
QWidget()

edited Oct 31, 2016 at 21:23

answered Oct 31, 2016 at 20:43

furas

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4 Comments

Giles Over a year ago

This was just a demonstration as It was an issue I found in a program about 500 lines long and the line edit was not intended to do anything but it does cause the error with lists and dictionaries.

furas Over a year ago

You get the same error without lists and dictionars too. Problem is not list or dictioarny but QListEditor without QApplication.

Giles Over a year ago

The error was occurring in a full program with QApplication and no in console error message but as I would prefer not to post the program due to plagiarism checks I understand it would be very difficult for you to help. I did not realise due to this that it was a separate issue. Thanks anyway.

furas Over a year ago

Maybe they put QListEditor in wrong place. If it is open source code then maybe you should send information to author.

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