PySide2在询问时未更新QLabel文本

Question

我正在从Python 2.7升级到Python 3.6，并从PySide升级到PySide2。我开始尝试从"入门"网站获取"Hello World"(https://doc-snapshots.qt.io/qtforpython/gettingstarted.html)正在工作。它显示小部件、标签和按钮，但按钮不会更改标签的文本。我添加了print((来验证按钮是否确实在调用与点击信号相关的方法，甚至添加了update((来尝试进一步"鼓励"它。运气不好。

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copied from:
#   https://doc-snapshots.qt.io/qtforpython/gettingstarted.html
#
# Mac OS X High Sierra (10.13.6)
#
# Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 05:52:31) 
# [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
#
# PySide2 5.11.1 
#
import sys
import random
from PySide2 import QtCore, QtWidgets, QtGui

class MyWidget(QtWidgets.QWidget):
def __init__(self):
super().__init__()
self.hello = ["Hallo Welt", "你好，世界", "Hei maailma",
"Hola Mundo", "Привет мир"]
self.button = QtWidgets.QPushButton("Click me!")
self.text = QtWidgets.QLabel("Hello World")
self.text.setAlignment(QtCore.Qt.AlignCenter)
self.text.setFont(QtGui.QFont("Titillium", 30))
self.button.setFont(QtGui.QFont("Titillium", 20))
self.layout = QtWidgets.QVBoxLayout()
self.layout.addWidget(self.text)
self.layout.addWidget(self.button)
self.setLayout(self.layout)
self.button.clicked.connect(self.magic)
def magic(self):
hi = random.choice(self.hello)
print(hi)              # Prints when clicked
self.text.setText(hi)  # Label text does not change when clicked
#       self.update()          # Didn't help
if __name__ == "__main__":
app = QtWidgets.QApplication([])
widget = MyWidget()
widget.resize(800, 600)
widget.show()
sys.exit(app.exec_())

与管道一起安装。而且，Pipfile:

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"
[[source]]
url = "http://download.qt.io/snapshots/ci/pyside/5.11/latest"
verify_ssl = false
name = "qt5"
[packages]
pyside2 = {version="*", index="qt5"}
[dev-packages]
[requires]
python_version = "3.6"

Answer 1

通过调整魔术函数在python3.6下修复了我的Mac上的这个问题

def magic(self):
self.text.setText(random.choice(self.hello))
self.repaint()

self.repaint((是出于某种原因而需要的，但至少可以工作。

Answer 2

如果您运行的是PySide2==5.15.0，那么您需要将其升级到5.15.1，这就解决了我的问题。

升级PySide2:的命令

pip/pip3 install --upgrade PySide2