我是PyGt中一个完整的新手程序员。我已经阅读了有关PyGt4的书,但现在我们有了PyGt5,我无法从书中运行我的例子。
例如,这是书中的第一个例子(最简单的)你可以看到
from PyQt5 import QtCore, QtGui
但它在书中
from PyQt4 import QtCore, QtGui
但是我写了PyQt5,因为我只有PyQt5
# -*- coding: utf-8 -*-
from PyQt5 import QtCore, QtGui
import sys
app = QtGui.QApplication(sys.argv)
window = QtGui.QWidget()
window.setWindowTitle("The first program in PyQt")
window.resize(300, 70)
label = QtGui.QLabel("<center>Hello, world!</center>")
btnQuit = QtGui.QPushButton("&Close window")
vbox = QtGui.QVBoxLayout()
vbox.addWidget(label)
vbox.addWidget(btnQuit)
window.setLayout(vbox)
QtCore.QObject.connect(btnQuit, QtCore.SIGNAL("clicked()"),
QtGui.qApp, QtCore.SLOT("quit()"))
window.show()
sys.exit(app.exec_())
错误:AttributeError:模块'PyQt5.QtGui'没有属性'QApplication'
我想找到解决方案: 我试着运行这段代码。不行。我的程序有效,但我无法关闭按钮“关闭窗口”
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5 import QtCore, QtGui
from PyQt5.QtCore import QObject, pyqtSignal
from PyQt5.QtWidgets import *
import sys
app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("The first example in PyQt")
window.resize(300, 70)
label = QLabel("<center>Hello, world!</center>")
btnQuit = QPushButton("&Close window")
vbox = QVBoxLayout()
vbox.addWidget(label)
vbox.addWidget(btnQuit)
window.setLayout(vbox)
closed = pyqtSignal()
range_changed = pyqtSignal(int, int, name='rangeChanged')
valueChanged = pyqtSignal([int], ['QString'])
window.show()
sys.exit(app.exec_())
答案 0 :(得分:2)
要关闭窗口,您必须将按钮点击信号连接到窗口的关闭功能
btnQuit.clicked.connect(window.close)
整个代码将是:
from PyQt5.QtWidgets import *
from PyQt5.QtCore import pyqtSignal
import sys
app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("The first example in PyQt")
window.resize(300, 70)
label = QLabel("<center>Hello, world!</center>")
btnQuit = QPushButton("&Close window")
vbox = QVBoxLayout()
vbox.addWidget(label)
vbox.addWidget(btnQuit)
window.setLayout(vbox)
btnQuit.clicked.connect(window.close)
window.show()
sys.exit(app.exec_())
请注意未使用的导入,您应该使用
from PyQt5 import QtWidgets
并将QApplication
替换为QtWidgets.QApplication
,将QLabel
替换为QtWidgets.QLabel
等等。
请记住,自PyQt5以来,信号已经改变了样式:Description