PyQt: Programming QT Widgets

Question

There are times when it is necessary to create as many widgets (for example, QtGui.QLineEdit ()), because there are values ​​in the list (we do not know how many values ​​are stored in the list variable). I could create a loop function that will execute as many times as there are values ​​stored in a list ... for example:

for each in myList:
    myLineEdit = QtGui.QLineEdit("myLineEdit")

The problem with this approach is that the same variable name is declared with each loop. There will be no access to the myLineEdit variable later. I heard some have success using eval ()? or exec ()? function. It would be interesting to see an example. If there is another way to do this, please post it. Here is a sample code to get you started (if you want):

from PyQt4 import QtCore, QtGui

app = QtGui.QApplication(sys.argv)

class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()

        mainQWidget = QtGui.QWidget()
        mainLayout=QtGui.QVBoxLayout()

        for i in range(5):
            exec( 'myGroupBox'+str(i)+'= QtGui.QGroupBox() ' )
            exec( 'myLayout'+str(i)+' = QtGui.QHBoxLayout()' )       

            exec( 'label'+str(i)+'=QtGui.QLabel("Name '+str(i)+': ")' )
            exec( 'self.myLineEdit'+str(i)+'=QtGui.QLineEdit()' )

            exec( 'myLayout'+str(i)+'.addWidget(label'+str(i)+')' )
            exec( 'myLayout'+str(i)+'.addWidget(self.myLineEdit'+str(i)+', QtCore.Qt.AlignRight)' )

            exec( 'myGroupBox'+str(i)+'.setLayout(myLayout'+str(i)+')' )
            exec( 'mainLayout.addWidget(myGroupBox'+str(i)+')' )

        mainQWidget.setLayout(mainLayout)        
        self.setCentralWidget(mainQWidget) 

window = MainWindow()
window.show()
window.resize(480,320)
sys.exit(app.exec_())

ANOTHER EXAMPLE:

from PyQt4 import QtCore, QtGui
import random
app = QtGui.QApplication(sys.argv)

class MainWindow(QtGui.QMainWindow):
    def __init__(self, argList):
        super(MainWindow, self).__init__()
        self.argList=argList

        mainQWidget = QtGui.QWidget()
        mainLayout=QtGui.QVBoxLayout()

        for i in range(len(self.argList)):
            exec( 'myGroupBox'+str(i)+'= QtGui.QGroupBox() ' )
            exec( 'myLayout'+str(i)+' = QtGui.QHBoxLayout()' )                   

            exec( 'label'+str(i)+'=QtGui.QLabel("Name '+str(self.argList[i])+': ")' )
            exec( 'label'+str(i)+'.setFixedWidth(100)' )
            exec( 'self.myLineEdit'+str(i)+'=QtGui.QLineEdit()' )
            exec( 'self.myLineEdit'+str(i)+'.setText("'+str(random.random())+'")' )


            exec( 'myLayout'+str(i)+'.addWidget(label'+str(i)+')' )
            exec( 'myLayout'+str(i)+'.addWidget(self.myLineEdit'+str(i)+', QtCore.Qt.AlignRight)' )

            exec( 'myGroupBox'+str(i)+'.setLayout(myLayout'+str(i)+')' )
            exec( 'mainLayout.addWidget(myGroupBox'+str(i)+')' )

        ButtonBox = QtGui.QGroupBox()
        ButtonsLayout = QtGui.QHBoxLayout()

        Button_01 = QtGui.QPushButton("Close")
        Button_01.clicked.connect(self.close)

        Button_02 = QtGui.QPushButton("Print")
        Button_02.clicked.connect(self.printOut)

        ButtonsLayout.addWidget(Button_01)
        ButtonsLayout.addWidget(Button_02)

        ButtonBox.setLayout(ButtonsLayout)
        mainLayout.addWidget(ButtonBox)

        mainQWidget.setLayout(mainLayout)
        self.setCentralWidget(mainQWidget)


    def printOut(self):
        for i in range(len(self.argList)):
            exec( 'print self.myLineEdit'+str(i)+'.text()' )
    def close(self):
        sys.exit()


myList=['One','Two','Tree','Four','Five','Six','Seven']
window = MainWindow(myList)
window.show()
window.resize(480,320)
sys.exit(app.exec_())

Answer 1

:

lineEdits = []
for _ in range(5):
    myLineEdit = QtGui.QLineEdit("myLineEdit")
    lineEdits.append(myLineEdit)

myLayout = QtGui.QHBoxLayout()
for lineEdit in lineEdits:
    myLayout.addWidget(lineEdit)

, :

lineEdits = {}
for i in range(5):
    myLineEdit = QtGui.QLineEdit("myLineEdit")
    lineEdits[i] = myLineEdit

lineEdits[3].setText("My new text")