Python tkinter，而不是事件错误

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")

当我这样做时，会发生这种情况:

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

Answer 1

当您使用bind时，tkinter会自动传递一个事件对象作为第一个参数。即使您使用 lambda 为 i 设置默认值，tkinter 始终将其设置为事件对象。

您需要将 lambda 更改为:

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