如何修改.textinput中的按钮？

Question

我在做菜单之类的

代码如下：

from turtle import TurtleScreen, RawTurtle, TK

root = TK.Tk()
root.title("ArMoon")
canvas = TK.Canvas(root, width=1000, height=700)
canvas.pack()
win = TurtleScreen(canvas)
dali = RawTurtle(win)

def Entrada():
    return win.textinput("Figura"," 1. Operando\n 2. Sumar operandos\
    \n 3. Reiniciar\n 4. Salir\n ")



while True:
    x = Entrada()
    if x == "4" or x == "":
        break
    oper = x.split()
    print(oper)
    x = oper[0]
    print(x)
    #if x <= 0:



win.mainloop()

问题是，当我运行程序时，在文本输入的小窗口中，它们向我显示两个按钮，我不介意，我喜欢它们，但有没有办法修改它们的功能

“确定”按钮似乎工作正常，但当我按下“取消”按钮，我得到一个错误

> Traceback (most recent call last):
> 
>   File "C:\Users\Lobo\Desktop\TORTUGA\Borrador v2.py", line 21, in
> <module>
> 
>     oper = x.split()
> 
> AttributeError: 'NoneType' object has no attribute 'split'

我想修改它，所以当我按下它只是运行'打破'结束

Answer 1

您应该修改代码，以便：

x = Entrada()
if x is None or x == "4":
   break

因为当cancel按钮返回None（类似于C中的空指针）而不是空字符串