尝试使用Tkinter和customtkinter来做各种密码检查，即使有正确的用户名和密码，我得到访问被拒绝.我尝试使用几种不同的方式和方法，我尝试做它没有Tkinter和它工作正常，Idk为什么它不工作

`import tkinter
import customtkinter
from PIL import ImageTk,Image
from pyttsx3 import *

customtkinter.set_appearance_mode("System") 
customtkinter.set_default_color_theme("blue") 

app = customtkinter.CTk() 
app.geometry("1920x1080")
app.attributes('-fullscreen',True)
app.title('Login')
n=0
USRd={"Goop": "S311","Drep": "S456"}

img1=ImageTk.PhotoImage(Image.open("Wallpaper.png"))
l1=customtkinter.CTkLabel(master=app,image=img1)
l1.pack()

frame=customtkinter.CTkFrame(master=l1, width=320, height=360, corner_radius=15)
frame.place(relx=0.5, rely=0.5, anchor=tkinter.CENTER)

l2=customtkinter.CTkLabel(master=frame, text="Log into your Account",font=('Century Gothic',20))
l2.place(x=50, y=45)

user = customtkinter.StringVar(value='')
entry1 = customtkinter.CTkEntry(
    master=frame,
    width=220,
    placeholder_text='Username',
    textvariable=user,
)
entry1.place(x=50, y=110)
user=entry1.get()

passw = customtkinter.StringVar(value='')
entry2=customtkinter.CTkEntry(master=frame, width=220, placeholder_text='Password', textvariable=passw)
entry2.place(x=50, y=165)
passw=entry2.get()

def button_function():
    for k in USRd:
        if (user==k) and (passw==USRd[k]):
            speak("Access Granted")
            x="Welcome back", k, "You have", USRd[k],"Notifications"
            speak(x)
            app.destroy()
            w = customtkinter.CTk()
            w.geometry("1280x720")
            w.title('Welcome')
            l1=customtkinter.CTkLabel(master=w, text=x ,font=('Century Gothic',60))
            l1.place(relx=0.5, rely=0.5,  anchor=tkinter.CENTER)
            w.mainloop()
        else:
            speak("Access Nope")

button1 = customtkinter.CTkButton(master=frame, width=220, text="Login", command=button_function, corner_radius=6)
button1.place(x=50, y=240)

if __name__ == "__main__":
    app.mainloop()`