當兩個密碼不匹配時，如何禁用 tkinter 視窗中的按鈕？
我的作業：
from tkinter import *
from functools import partial
root = Tk()
root.geometry('280x100')
root.title('Tkinter Password')
def validation_pw(ep,cp):
if ep.get() == cp.get():
Label(root, text = "Confirmed").grid(column=0, row=5)
else:
Label(root, text = "Not matched").grid(column=0, row=5)
# check_button['state'] = DISABLED <============================
ep = StringVar()
cp = StringVar()
Label1 = Label(root, text = "Enter Password").grid(column=0, row=0)
pwEnty = Entry(root, textvariable = ep, show = '*').grid(column=1, row=0)
# Confirmed password label
Label2 = Label(root, text = "Confirm Password").grid(column=0, row=1)
pwconfEnty = Entry(root, textvariable = cp, show = '*').grid(column=1, row=1)
validation_pw = partial(validation_pw, ep,cp)
check_button = Button(root, text = "check", command = validation_pw).grid(column=0, row=4)
root.mainloop()
它顯示兩個密碼是否不匹配。
現在，如果兩個密碼不匹配，我想禁用復選按鈕。如果失敗，我希望用戶不能再嘗試密碼。
所以在函式validation_pw中，我添加了check_button['state'] = DISABLED.
但是，會彈出一個錯誤
TypeError: 'NoneType' object does not support item assignment
如何解決這個問題？謝謝！
uj5u.com熱心網友回復：
您的檢查按鈕實際上是無，因為它是grid函式的結果。
要修復它，首先宣告按鈕，然后對其進行網格化。
前：
check_button = Button(
root, text = "check",
command = validation_pw).grid(column=0, row=4) # Result of Button.grid function
print(check_button) # None
后：
check_button = Button(root, text = "check", command = validation_pw)
check_button.grid(column=0, row=4)
print(check_button) # Button object ...
uj5u.com熱心網友回復：
你會得到錯誤，NoneType因為在某一時刻它沒有被分配任何東西。這是因為您.grid在與按鈕相同的行上使用了。固定代碼：
from tkinter import *
from functools import partial
root = Tk()
root.geometry('280x100')
root.title('Tkinter Password')
def validation_pw(ep,cp):
if ep.get() == cp.get():
Label(root, text = "Confirmed").grid(column=0, row=5)
else:
Label(root, text = "Not matched").grid(column=0, row=5)
check_button['state'] = DISABLED
ep = StringVar()
cp = StringVar()
Label1 = Label(root, text = "Enter Password").grid(column=0, row=0)
pwEnty = Entry(root, textvariable = ep, show = '*').grid(column=1, row=0)
# Confirmed password label
Label2 = Label(root, text = "Confirm Password").grid(column=0, row=1)
pwconfEnty = Entry(root, textvariable = cp, show = '*').grid(column=1, row=1)
validation_pw = partial(validation_pw, ep,cp)
check_button = Button(root, text = "check", command = validation_pw)
check_button.grid(column=0, row=4)
root.mainloop()
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