The Converted .py File Of Qt Is Not Working For Opening New Window

I have done simple Qt programming, for that I have two windows MainWindow and NewWindow. MainWindow is having one push button called mMyButton. My mainwindow.h is: #ifndef MAINWIND

Solution 1:

This one will work. However, it's extremely ugly and glued together. In short: You can't have two main windows. What you likely want is a QDialog or an additional QWidget. I strongly suggest you to read a PySide or PyQT beginners tutorial, f.e. http://zetcode.com/gui/pysidetutorial/

from PySide import QtCore, QtGui

try:
  _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
  _fromUtf8 = lambda s: s

class Ui_MainWindow(object):
  def setupUi(self, MainWindow):
    self.mainwindow=MainWindow
    MainWindow.setObjectName(_fromUtf8("MainWindow"))
    MainWindow.resize(400, 300)
    self.centralWidget = QtGui.QWidget(MainWindow)
    self.centralWidget.setObjectName(_fromUtf8("centralWidget"))
    self.mMyButton = QtGui.QPushButton(self.centralWidget)
    self.mMyButton.setGeometry(QtCore.QRect(140, 90, 99, 27))
    self.mMyButton.setObjectName(_fromUtf8("mMyButton"))
    MainWindow.setCentralWidget(self.centralWidget)
    self.menuBar = QtGui.QMenuBar(MainWindow)
    self.menuBar.setGeometry(QtCore.QRect(0, 0, 400, 25))
    self.menuBar.setObjectName(_fromUtf8("menuBar"))
    MainWindow.setMenuBar(self.menuBar)
    self.mainToolBar = QtGui.QToolBar(MainWindow)
    self.mainToolBar.setObjectName(_fromUtf8("mainToolBar"))
    MainWindow.addToolBar(QtCore.Qt.TopToolBarArea, self.mainToolBar)
    self.statusBar = QtGui.QStatusBar(MainWindow)
    self.statusBar.setObjectName(_fromUtf8("statusBar"))
    MainWindow.setStatusBar(self.statusBar)

    self.retranslateUi(MainWindow)
    QtCore.QMetaObject.connectSlotsByName(MainWindow)
    self.mMyButton.clicked.connect(self.showNewWindow)

  def retranslateUi(self, MainWindow):
    MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
    self.mMyButton.setText(QtGui.QApplication.translate("MainWindow", "Addition", None, QtGui.QApplication.UnicodeUTF8))


  def showNewWindow(self):
    ui = Ui_NewWindow()
    ui.setupUi(QtGui.QDialog())
    ui.NewWindow.exec_()


try:
  _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
  _fromUtf8 = lambda s: s

class Ui_NewWindow(object):
  def setupUi(self, NewWindow):
    self.NewWindow=NewWindow
    self.NewWindow.setObjectName(_fromUtf8("NewWindow"))
    self.NewWindow.resize(439, 225)
    self.centralwidget = QtGui.QWidget(NewWindow)
    self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
    self.pushButton_2 = QtGui.QPushButton(self.centralwidget)
    self.pushButton_2.setGeometry(QtCore.QRect(170, 140, 99, 27))
    self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
    self.widget = QtGui.QWidget(self.centralwidget)
    self.widget.setGeometry(QtCore.QRect(40, 30, 365, 89))
    self.widget.setObjectName(_fromUtf8("widget"))
    self.verticalLayout = QtGui.QVBoxLayout(self.widget)
    #self.verticalLayout.setMargin(0)
    self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
    self.horizontalLayout_2 = QtGui.QHBoxLayout()
    self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2"))
    self.label_3 = QtGui.QLabel(self.widget)
    self.label_3.setObjectName(_fromUtf8("label_3"))
    self.horizontalLayout_2.addWidget(self.label_3)
    self.lineEdit = QtGui.QLineEdit(self.widget)
    self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
    self.horizontalLayout_2.addWidget(self.lineEdit)
    self.label_4 = QtGui.QLabel(self.widget)
    self.label_4.setObjectName(_fromUtf8("label_4"))
    self.horizontalLayout_2.addWidget(self.label_4)
    self.lineEdit_2 = QtGui.QLineEdit(self.widget)
    self.lineEdit_2.setObjectName(_fromUtf8("lineEdit_2"))
    self.horizontalLayout_2.addWidget(self.lineEdit_2)
    self.verticalLayout.addLayout(self.horizontalLayout_2)
    self.pushButton = QtGui.QPushButton(self.widget)
    self.pushButton.setObjectName(_fromUtf8("pushButton"))
    self.verticalLayout.addWidget(self.pushButton)
    self.horizontalLayout = QtGui.QHBoxLayout()
    self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
    self.label = QtGui.QLabel(self.widget)
    self.label.setObjectName(_fromUtf8("label"))
    self.horizontalLayout.addWidget(self.label)
    self.label_2 = QtGui.QLabel(self.widget)
    self.label_2.setObjectName(_fromUtf8("label_2"))
    self.horizontalLayout.addWidget(self.label_2)
    self.verticalLayout.addLayout(self.horizontalLayout)
    self.menubar = QtGui.QMenuBar(NewWindow)
    self.menubar.setGeometry(QtCore.QRect(0, 0, 439, 25))
    self.menubar.setObjectName(_fromUtf8("menubar"))

    self.statusbar = QtGui.QStatusBar(NewWindow)
    self.statusbar.setObjectName(_fromUtf8("statusbar"))

    self.retranslateUi(NewWindow)
    QtCore.QMetaObject.connectSlotsByName(NewWindow)
    self.pushButton.clicked.connect(self.sum)


  def sum(self):
    summed = float(self.lineEdit.text()) + float(self.lineEdit_2.text())
    self.label_2.setText(str(summed))

  def retranslateUi(self, NewWindow):
    self.NewWindow.setWindowTitle(QtGui.QApplication.translate("NewWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButton_2.setText(QtGui.QApplication.translate("NewWindow", "Exit", None, QtGui.QApplication.UnicodeUTF8))
    self.label_3.setText(QtGui.QApplication.translate("NewWindow", "A = ", None, QtGui.QApplication.UnicodeUTF8))
    self.lineEdit.setText(QtGui.QApplication.translate("NewWindow", "0.0", None, QtGui.QApplication.UnicodeUTF8))
    self.label_4.setText(QtGui.QApplication.translate("NewWindow", "B = ", None, QtGui.QApplication.UnicodeUTF8))
    self.lineEdit_2.setText(QtGui.QApplication.translate("NewWindow", "0.0", None, QtGui.QApplication.UnicodeUTF8))
    self.pushButton.setText(QtGui.QApplication.translate("NewWindow", "Add", None, QtGui.QApplication.UnicodeUTF8))
    self.label.setText(QtGui.QApplication.translate("NewWindow", "Answer  : ", None, QtGui.QApplication.UnicodeUTF8))
    self.label_2.setText(QtGui.QApplication.translate("NewWindow", "0.0", None, QtGui.QApplication.UnicodeUTF8))


if __name__ == "__main__":
  import sys
  app = QtGui.QApplication(sys.argv)
  MainWindow = QtGui.QMainWindow()
  ui = Ui_MainWindow()
  ui.setupUi(MainWindow)
  MainWindow.show()
  sys.exit(app.exec_())