from tkinter import *

root = Tk()
root.geometry("400x200")
root.resizable(0, 0)
root.config(bg="#d9ead3")
root.title("contar uma letra especifica de uma frase")
def limpar():
    frase_entrada.delete(0, END)
    letra_entrada.delete(0, END)
def app():
    f = frase.get().lower()
    l = letra.get()
    contar = 0
    for c in f:
        if c == l:
            contar += 1
    mensagem =f"A letra  {l} apareceu {contar} vezes na frase."
    resultado.set(mensagem)
titulo = Label(text="Contar uma letra especifica de uma frase",
               font=("Arial", "13", "bold"),bg="#d9ead3",fg="#bf9000")
titulo.place(relx=0.1, rely=0.05)
texto_sub1  = Label(text="Frase:",
                    font=("Arial", "12", "bold"),bg="#d9ead3",fg="#bf9000")
texto_sub1.place(relx=0.15, rely=0.3)

texto_sub2  = Label(text="Letra:",
                    font=("Arial", "12", "bold"),bg="#d9ead3",fg="#bf9000")
texto_sub2.place(relx=0.15, rely=0.45)

frase = StringVar()
frase_entrada = Entry(textvariable=frase,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
frase_entrada.place(relx=0.3, rely=0.3, relwidth=0.65)

letra = StringVar()
letra_entrada = Entry(textvariable=letra,
                             font=("Arial", "12", "bold"),
                             bg="white", fg="blue", justify='center')
letra_entrada.place(relx=0.5, rely=0.45, relwidth=0.15)

#
but1 = Button(text="Verificar", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'),command=app)
but1.place(relx=0.05, rely=0.65, 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=0.65, 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=0.65, relwidth=0.25, relheight=0.1)
resultado = StringVar()
resultado_texto = Label(textvariable=resultado,
                           font=("Arial", 12, "bold"), bg="#d9ead3")
resultado_texto.place(relx=0.2, rely=0.8, relwidth=0.7,relheight=0.1)
root.mainloop()