如何在QRadioButton上单击多次，但只能运行一次功能？

Question

I have 2 radio buttons. The first one, radio1 , is connected to a function func() and inside this function connects a push button, pushButton , to another function print_me() .

This is the code stripped down:

radio = self.dockwidget.radioButton
radio.clicked.connect(func)

def func():
    # Connect pushButton to "print_me" function
    connect = self.dockwidget.pushButton
    connect.clicked.connect(print_me)

def print_me():
    print 'Connected'

When the user clicks radio1 and then pushButton , a message is printed. Problem is if the user clicks radio 10 times and then pushButton , the message is also printed 10 times. Or if the user clicks radio1 , then radio2 , and back to radio1 , it will still print the message twice.

Is there a way to prevent this so that it will only print the message once when either radio button is clicked?

Answer 1

Have a global variable and set it to either True or False . Then add an if statement to your code (In this example the global variable name is clicked_radio_button ):

radio = self.dockwidget.radioButton
radio.clicked.connect(func)
clicked_radio_button = False #Set global variable
def func():
    if clicked_radio_button == False:
         # Connect pushButton to "print_me" function
         connect = self.dockwidget.pushButton
         connect.clicked.connect(print_me)
         clicked_radio_button = True #Set global variable to True
    else:
        pass #Do nothing if already pressed

def print_me():
    print 'Connected'