pyqt4 python QT全球

Question

我写了非常简单的python＆Qt代码。

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Form(object):

    def setupUi(self, Form):
        Form.setObjectName(_fromUtf8("Form"))
        Form.resize(619, 501)
        self.pushButton = QtGui.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(60, 460, 98, 27))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.comboBox = QtGui.QComboBox(Form)
        self.comboBox.setGeometry(QtCore.QRect(20, 410, 78, 27))
        self.comboBox.setObjectName(_fromUtf8("comboBox"))
        self.comboBox.addItem(_fromUtf8(""))
        self.comboBox.addItem(_fromUtf8(""))
        self.comboBox.addItem(_fromUtf8(""))
        self.comboBox_2 = QtGui.QComboBox(Form)
        self.comboBox_2.setGeometry(QtCore.QRect(120, 410, 78, 27))
        self.comboBox_2.setObjectName(_fromUtf8("comboBox_2"))
        self.comboBox_2.addItem(_fromUtf8(""))
        self.comboBox_2.addItem(_fromUtf8(""))
        self.comboBox_2.addItem(_fromUtf8(""))
        self.label = QtGui.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(20, 380, 81, 21))
        self.label.setObjectName(_fromUtf8("label"))
        self.label_2 = QtGui.QLabel(Form)
        self.label_2.setGeometry(QtCore.QRect(120, 380, 91, 21))
        self.label_2.setObjectName(_fromUtf8("label_2"))

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        Form.setWindowTitle(_translate("Form", "Form", None))
        self.pushButton.setText(_translate("Form", "BASLA", None))
        self.comboBox.setItemText(0, _translate("Form", "780", None))
        self.comboBox.setItemText(1, _translate("Form", "1350", None))
        self.comboBox.setItemText(2, _translate("Form", "1850", None))
        self.comboBox_2.setItemText(0, _translate("Form", "64", None))
        self.comboBox_2.setItemText(1, _translate("Form", "128", None))
        self.comboBox_2.setItemText(2, _translate("Form", "256", None))
        self.label.setText(_translate("Form", "USRP FRQ", None))
        self.label_2.setText(_translate("Form", "FFT BOYUTU", None))

    def deger(self):
        self.us=int(self.comboBox.currentText()) 
        #print "USRP Frekansı",self.us
        self.fft=int(self.comboBox_2.currentText()) 
        #print "FFT Boyutu",self.fft

    def basla(self):
        QtCore.QObject.connect(self.pushButton, QtCore.SIGNAL("clicked()"), self.deger)


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Form = QtGui.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    ui.basla()
    Form.show()
    print ui.us   
    app.exec_()

当我运行程序时，我收到一条错误消息。 追溯（最近一次呼叫最近）：打印ui.us中的文件“ ./dene.py”，第88行，AttributeError：'Ui_Form'对象没有属性'us'。

我试过了 ：

def deger():
     global us
     us=int(comboBox.currentText())

我目前收到以下错误：

我们正在打印文件“ ./tt2.py”，行71，NameError：未定义全局名称“ us”

造成此错误的原因是什么？ 如何避免此错误？ 请帮帮我

Answer 1

首先，不要使用全局变量。

关于你的问题。 您收到导入错误，因为在打印语句之前未分配self.us（您未调用方法“ deger”）。 无论如何，您应该使用PyQt ui生成器创建ui文件，这样就不会出现此类错误。

Answer 2

我修改了您的代码。 现在，它不再发出错误消息，并且单击按钮后，您将获得打印组合框的内容。 如果仍然有任何问题，请告诉我。 我很乐意为您服务。

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_Form(object):

    def __init__(self):
        self.us = None

    def setupUi(self, Form):
        Form.setObjectName(_fromUtf8("Form"))
        Form.resize(619, 501)
        self.pushButton = QtGui.QPushButton(Form)
        self.pushButton.setGeometry(QtCore.QRect(60, 460, 98, 27))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.comboBox = QtGui.QComboBox(Form)
        self.comboBox.setGeometry(QtCore.QRect(20, 410, 78, 27))
        self.comboBox.setObjectName(_fromUtf8("comboBox"))
        self.comboBox.addItem(_fromUtf8(""))
        self.comboBox.addItem(_fromUtf8(""))
        self.comboBox.addItem(_fromUtf8(""))
        self.comboBox_2 = QtGui.QComboBox(Form)
        self.comboBox_2.setGeometry(QtCore.QRect(120, 410, 78, 27))
        self.comboBox_2.setObjectName(_fromUtf8("comboBox_2"))
        self.comboBox_2.addItem(_fromUtf8(""))
        self.comboBox_2.addItem(_fromUtf8(""))
        self.comboBox_2.addItem(_fromUtf8(""))
        self.label = QtGui.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(20, 380, 81, 21))
        self.label.setObjectName(_fromUtf8("label"))
        self.label_2 = QtGui.QLabel(Form)
        self.label_2.setGeometry(QtCore.QRect(120, 380, 91, 21))
        self.label_2.setObjectName(_fromUtf8("label_2"))

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        Form.setWindowTitle(_translate("Form", "Form", None))
        self.pushButton.setText(_translate("Form", "BASLA", None))
        self.pushButton.clicked.connect(self.buttonAction)
        self.comboBox.setItemText(0, _translate("Form", "780", None))
        self.comboBox.setItemText(1, _translate("Form", "1350", None))
        self.comboBox.setItemText(2, _translate("Form", "1850", None))
        self.comboBox_2.setItemText(0, _translate("Form", "64", None))
        self.comboBox_2.setItemText(1, _translate("Form", "128", None))
        self.comboBox_2.setItemText(2, _translate("Form", "256", None))
        self.label.setText(_translate("Form", "USRP FRQ", None))
        self.label_2.setText(_translate("Form", "FFT BOYUTU", None))

    def deger(self):
        self.us=int(self.comboBox.currentText()) 
        #print "USRP Frekansı",self.us
        self.fft=int(self.comboBox_2.currentText()) 
        #print "FFT Boyutu",self.fft

    def buttonAction(self):
        print("The button has been clicked")
        print("Text in comboBox 1: " + self.comboBox.currentText())
        print("Text in comboBox 2: " + self.comboBox_2.currentText())


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Form = QtGui.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    print(ui.us)   
    app.exec_()