python - 如何在点击后删除 tkinter 中的消息

Question

我正在尝试从 tkinter 删除一条消息。你能帮我吗？

Label(root,text="Password : ").place(x=X+0,y=Y+170,in_=root)          #password to registor
reg_password=StringVar()
e5 = Entry(root,textvariable=reg_password).place(x=X+65,y=Y+170,in_=root)

m=Message(root,text='',fg="red").place(x=X+0,y=Y+250,in_=root)    
def sign_up():
    global m
    regpass = "^[A-Z][\w(!@#$%^&*_+?)+]{8,}$"
    if not (re.search(regpass,reg_password.get())):
        m.config(text='''->Spaces and empty sets are not allowed.
        \n ->First character should be a captial letter.
        \n ->Password must be greater than 8 character and must contain a special character.''')
    else:
        pass

如果第一次输入密码错误，则会打印该消息，第二次如果密码正确，该消息将被删除

但是显示错误

AttributeError: 'NoneType' object has no attribute 'config'

Answer 1

place() 方法不返回值，因此语句:

m=Message(root,text='',fg="red").place(x=X+0,y=Y+250,in_=root) 

将值None赋给变量m。

将其分成两个语句:

m = Message(root, text='', fg="red")
m.place(x=X+0, y=Y+250, in_=root)