Python GUI Menu Issue

Question

I am trying to create a code that establishes a menu on my gui using python. The issue is, it keeps calling the function the null function when I create the New option under file. It is only supposed to go off when I click on new, but it goes off when I run the program. I used the print function in null to let me know when it's being called

class Board:
    def __init__(self, master):
        self.master = master
        self.setup()

    def null(self):
        print('o')


    def setup(self):


        board = tk.Canvas(self.master, width = 800, height = 800)
        board.pack()

        #Creates the Walls/Floor
        board.create_line(0, 790,800, 790, width = 20) #Creates Bottom Line
        board.create_line(10, 800,10, 100, width = 35) #Creates Left Wall
        board.create_line(790, 800, 790, 100, width = 35) #Creates Right Wall

        space = 20
        for x in range(6): #Creates pillars
            space += 108.5
            board.create_line(space, 800, space, 150, width = 20)

            board.pack() 

    def newgame(self):        
        self.menubar = tk.Menu(self.master)
        self.filemenu = tk.Menu(self.master, tearoff = 0)
        self.filemenu.add_command(label="New", command = self.null())
        self.menubar.add_cascade(label="File", menu=self.filemenu)
        self.filemenu.add_separator()
        self.master.config(menu=self.menubar)

user2555451 · Accepted Answer · 2013-11-23 01:46:25Z

1

self.null is being invoked (going off) because you are telling it to do so by placing () after it. Remember that Python uses (...) after a function name to invoke that function.

To fix the problem, simply remove the parenthesis:

self.filemenu.add_command(label="New", command=self.null)

Now, command is set to a reference of self.null.

answered Nov 23, 2013 at 1:46

user2555451

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