Python Tkinter——对象没有属性'tk'

Question

我正在使用 tkinter 创建一个 gui，我需要使用登录窗口和后续窗口，我无法在新窗口上放置任何标签，因为它说“testclass”对象没有属性“tk”

我的主要目标是在登录后创建一个新窗口并隐藏登录窗口，然后使用新窗口并放置标签并创建一个表单

from tkinter import *
import tkinter.messagebox as tm


class LoginFrame(Frame):

    def __init__(self, master):
        super().__init__(master)

        self.label_username = Label(self, text="Username")
        self.label_password = Label(self, text="Password")

        self.entry_username = Entry(self)
        self.entry_password = Entry(self, show="*")

        self.label_username.grid(row=0, sticky=E)
        self.label_password.grid(row=1, sticky=E)
        self.entry_username.grid(row=0, column=1)
        self.entry_password.grid(row=1, column=1)

        self.logbtn = Button(self, text="Login", command=self._login_btn_clicked)
        self.logbtn.grid(columnspan=2)

        self.pack()


    # def verifycred(self,username,password):


    def _login_btn_clicked(self):
        username = self.entry_username.get()
        password = self.entry_password.get()

        # verify_out = self.verifycred(username,password)

        self.newWindow = Toplevel(self.master)
        self.app = randomclass(self.newWindow)

class randomclass(LoginFrame):

    def __init__(self,master):
        self.master = master
        self.master.title("Random Class")
        self.master.geometry("1350x750+250+150")
        self.master.config(bg ='cadet blue')
        self.frame = Frame(self.master, bg = 'powder blue')
        self.frame.pack()

        self.test = Button(self.frame,text='Random',width = 25, command = self.random)
        self.test.grid(row=4,column=0)



    def random(self):
        self.newWindow = Toplevel(self.master)
        self.app = testclass(self.newWindow)
class testclass(LoginFrame):

    def __init__(self,master):
        self.master = master
        self.master.title("Test")
        self.master.geometry("1350x750+250+150")
        self.master.config(bg ='cadet blue')
        self.frame = Frame(self.master, bg = 'powder blue')
        self.frame.pack()

        self.welcome = Label(self,text='Hello')
        self.welcome.grid(row=0,column=1)



root = Tk()
lf = LoginFrame(root)
root.mainloop()

Answer 1

只有一个小问题是你忘记在 testclass 的标签小部件声明中编写 self.master。

这是解决方案，

class testclass(LoginFrame):

def __init__(self,master):
    self.master = master
    self.master.title("Test")
    self.master.geometry("1350x750+250+150")
    self.master.config(bg ='cadet blue')
    self.frame = Frame(self.master, bg = 'powder blue')
    self.frame.grid(row = 0,column = 0)

    self.welcome = Label(self.master,text='Hello')
    self.welcome.grid(row=0,column=1)