QLIneEdit的PyQt错误

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.

Answer 1

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()