为什么我的Tkinter小部件存储为None？

Question

我把按钮放到一个阵列中但是当我打电话给他们时他们不在那里.如果我打印出阵列,我得到:

{0: None, 1: None, 2: None, 3: None, 4: None, 5: None, 6: None, 7: None, ...}

我只是不知道我做错了什么.

from tkinter import *

def main():
    pass

if __name__ == '__main__':
    main()

b={}

app = Tk()
app.grid()

f = Frame(app, bg = "orange", width = 500, height = 500)
f.pack(side=BOTTOM, expand = 1)


def color(x):
   b[x].configure(bg="red") # Error 'NoneType' object has no attribute 'configure'
   print(b) # 0: None, 1: None, 2: None, 3: None, 4: None, 5:.... ect


def genABC():
    for r in range(3):
        for c in range(10):
            if (c+(r*10)>25):
                break
            print(c+(r*10))
            b[c+(r*10)] = Button(f, text=chr(97+c+(r*10)), command=lambda a=c+(r*10): color(a), borderwidth=1,width=5,bg="white").grid(row=r,column=c)

genABC()
app.mainloop()

Answer 1

的grid,pack和place每一个部件Tkinter的方法操作就地并始终返回None.这意味着您无法在创建窗口小部件的同一行中调用它们.相反,它们应该在下面的行上调用:

widget = ...
widget.grid(...)

widget = ...
widget.pack(...)

widget = ...
widget.place(...)

所以,在你的代码中,它将是:

b[c+(r*10)] = Button(f, text=chr(97+c+(r*10)), command=lambda a=c+(r*10): color(a), borderwidth=1,width=5,bg="white")
b[c+(r*10)].grid(row=r,column=c)