Python tkinter, not Event error

Question

Class xy:
 ...
 ...
 ...
    self.btns = []
    for x in enumerate(dates):
        self.btns.append(tk.Button(bf, text = x[1], height = 2, width = 12, command = lambda i = x[0]: self.show_frame(pages[i])))
        self.btns[x[0]].pack(side = "left")
        self.btns[x[0]].bind("<Button-1>", lambda i = x[0]: self.active(i)) # THERE IS AN ERROR

    self.show_frame(pages[0])


def show_frame(self, key):
    frame = self.frames[key]
    frame.tkraise()

def active(self, index):
    self.btns[index].config(relief = "sunken")

When I do this, that happen:

"TypeError: list indices must be integers or slices, not Event"I'm trying figure it out for hour.

Did the error message tell you what line the problem was on? If we knew it might be easier to identify the problem. — Ben J.
– Ben J., Commented Mar 13, 2016 at 23:58
Line with a method active(), self.btns[index].config(relief = "sunken") — Gromit
– Gromit, Commented Mar 14, 2016 at 0:00

Bryan Oakley · Accepted Answer · 2016-03-14 01:46:14Z

3

When you use bind, tkinter will automatically pass an event object as the first parameter. Even though you're using lambda to set a default for i, tkinter always sets it to the event object.

You need to change your lambda to this:

lambda event, i=x[0]: self.active(i)

answered Mar 14, 2016 at 1:46

Bryan Oakley

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