add a command to tkinter button by a string

Question

I tried to make a function which create a button with a command (action) on a window but I can't specify a self variable.

The function :

    def addButton(self,text,row,column,pady,action):

    action = "Window."+str(action)
    print(action)
    button = Button(self.Window, text=str(text), command=lambda:exec(action))
    button.grid(row=int(row),column=int(column),pady=int(pady),sticky=EW)
    self.buttons.append(button)

I'll be grateful if someone can help me

getattr is your friend: docs.python.org/3/library/functions.html#getattr. Your question is unclear, so I can't help tell you exactly what to do, but you can use getattr to retrieve the callable object that you want to be your action. It would look something like: action_obj = getattr(Window, action) — SyntaxVoid
– SyntaxVoid, Commented Dec 5, 2019 at 22:26

Bryan Oakley · Accepted Answer · 2019-12-05 22:30:11Z

2

For any python object you can use getattr to get an attribute by name. In your case you could use something like this:

func = getattr(self.Window, action)
button = Button(..., command = func)

There's no need to use exec, since in this case getattr will return a reference to a function (a callable), and the command attribute requires a reference to a function.

answered Dec 5, 2019 at 22:30

Bryan Oakley

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