While loop problem in pyqt

[neverlander]

I am new here, so I hope it is not a wrong place to ask for pyqt.

I wrote a while loop in pyqt but I want it to stop to take input from user.I do this in python with raw_input but it doesn't work in pyqt.How can I do this in pyqt.

cev = str(ui.lineEdit.text()).lower()
 
guess = 0
f = 0
 
while cev != answer:
	guess += 1
 
	ui.label_6.setText(QtGui.QApplication.translate("MainWindow", "Wrong answer!", None, QtGui.QApplication.UnicodeUTF8))
 
	f += 1
 
	ui.label_4.setText(answer[0:f])
 
	if answer[0:f] == answer[0:]:
		ui.label_4.setText(answer[0:f])
		ui.label_6.setText(QtGui.QApplication.translate("MainWindow"," Answer is revealed", None, QtGui.QApplication.UnicodeUTF8))
 
		ui.label_9.setText(QtGui.QApplication.translate("MainWindow", soz[sor1], None, QtGui.QApplication.UnicodeUTF8))				
		liste.pop(s)
		return self.sor()
HERE ?
"cev = raw_input("..................:")"

cev = str(ui.lineEdit.text()).lower()
		
guess = 0
f = 0

while cev != answer:
	guess += 1
	
	ui.label_6.setText(QtGui.QApplication.translate("MainWindow", "Wrong answer!", None, QtGui.QApplication.UnicodeUTF8))
	
	f += 1
	
	ui.label_4.setText(answer[0:f])
	
	if answer[0:f] == answer[0:]:
		ui.label_4.setText(answer[0:f])
		ui.label_6.setText(QtGui.QApplication.translate("MainWindow"," Answer is revealed", None, QtGui.QApplication.UnicodeUTF8))
		
		ui.label_9.setText(QtGui.QApplication.translate("MainWindow", soz[sor1], None, QtGui.QApplication.UnicodeUTF8))				
		liste.pop(s)
		return self.sor()
HERE ?
"cev = raw_input("..................:")"

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I need a code here to take input from user like "raw_input"