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Python 为什么我的Tkinter小部件存储为None?_Python_Button_Dictionary_Tkinter - Fatal编程技术网

Python 为什么我的Tkinter小部件存储为None?

Python 为什么我的Tkinter小部件存储为None?,python,button,dictionary,tkinter,Python,Button,Dictionary,Tkinter,我将我的按钮放入一个数组中,但当我调用它们时,它们不在那里。如果我打印出阵列,我会得到: {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()

我将我的按钮放入一个数组中,但当我调用它们时,它们不在那里。如果我打印出阵列,我会得到:

{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()
每个Tkinter小部件的、和方法在适当的位置运行,并始终返回
None
。这意味着您不能在创建小部件时在同一行调用它们。相反,应在以下行调用它们:

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

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

widget = ...
widget.place(...)
因此,在您的代码中,应该是:

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)