Verificador de Força de Senha

from tkinter import *
root = Tk()
root.geometry("400x300")
root.resizable(0, 0)
root.config(bg="#054c69")
root.title("Verificador de Força de Senha")
titulo = Label(text="Verificador de Força de Senha",
               font=("Arial", "19", "bold"),bg="#054c69",fg="#0edeed")
titulo.place(relx=0.05, rely=0.05)
texto_sub1  = Label(text="Senha:",
                    font=("Arial", "15", "bold"),bg="#054c69",fg="#0edeed")
texto_sub1.place(relx=0.15, rely=0.35)

Senha = StringVar()
Senha_entrada = Entry(textvariable=Senha,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
Senha_entrada.place(relx=0.35, rely=0.35, relwidth=0.6)
def limpar():
    Senha_entrada.delete(0, END)
    resultado.set("")
def app():
    pontuacao = 0
    s = Senha.get()
    if len(s) >= 8:
        pontuacao += 1
    if re.search(r'[a-z]', s) and re.search(r'[A-Z]', s):
        pontuacao += 1
    if re.search(r'\d', s):
        pontuacao += 1
    if re.search(r'[!@#$%^&*()_+{}:;<>,.?~]', s):
        pontuacao += 1
    if pontuacao == 4:
        mensagem = "Senha Forte"
    elif pontuacao >= 2:
        mensagem = "Senha Média"
    else:
        mensagem = "Senha Fraca"
    resultado.set(mensagem)
but1 = Button(text="Verificar", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=app)
but1.place(relx=0.05, rely=0.55, relwidth=0.25, relheight=0.1)
but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=limpar)
but_limpar.place(relx=0.35, rely=0.55, relwidth=0.25, relheight=0.1)

but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=root.destroy)
but_sair.place(relx=0.65, rely=0.55, relwidth=0.25, relheight=0.1)

resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
                           font=("Arial", 12, "bold"), bg="#cfe2f3")
resultado_texto.place(relx=0.05, rely=0.7, relwidth=0.9,relheight=0.25)

root.mainloop()