tkinger button index array

想在 tkinter 裡動態產生多個按鈕，但如下使用下面的 code, 完全無事件，command 在被產生時，就執行完了。

下面這篇是「錯誤答案」：
https://stackoverflow.com/questions/57554418/get-the-index-of-a-button-while-pressing-which-is-in-an-array

you can pass argument to the function you use as command.

example:

def myButttonCommand(index):

   print("this is the "+index+"th' button")

buttons = []

for i in range (0,10):

   buttons[i] = tk.Button(command=myButtonCommand(i))

正解是這一篇：
https://stackoverflow.com/questions/55734067/how-to-assign-an-array-element-to-a-tkinter-button-via-for-each-loop

Question: assign an Array element to a tkinter button via for each loop?

If you want to get the Button['text'] on click, use .bind(<Button-1>... instead of command=:

import tkinter as tk

class App(tk.Tk):
    def __init__(self):
        super().__init__()

        for r in range(1, 8):
            for c in range(1, 5):
                btn = tk.Button(self, text=chr((r*4)+c+60),
                                height='1', width='1',
                                bg='white', fg='deep sky blue', font=("Helvetica", 18))
                btn.grid(row=r,column=c)
                btn.bind('<Button-1>', self.listitems)

    def listitems(self, event):
        print(event.widget['text'])

if __name__ == "__main__":
    App().mainloop()