from tkinter import *
root = Tk()
root.geometry("500x350")
root.resizable(0, 0)
root.config(bg="#103030")
root.title("hz para bpm e vice-versa")
titulo = Label(text="hz para bpm e vice-versa",
               font=("Arial", "28", "bold"), bg="#103030", fg="#49e3e3")
titulo.place(relx=0.05, rely=0.05)
var = StringVar()
dropDownList = ["hertz (hz)", "Beats por minuto (bpm)"]
dropdown = OptionMenu(root, var, *dropDownList)
var.set(dropDownList[0])
dropdown.place(relx=0.33, rely=0.45,relwidth=0.4)
dropdown.config(background='#09A3BA', foreground="#FFFFFF",font=("Arial", "16", "bold"))
dropdown["menu"].config(background='#09A3BA', foreground="#FFFFFF",font=("Arial", "16", "bold"))
texto_sub1 = Label(text="Valor:",
                   font=("Arial", "18", "bold"), bg="#103030", fg="#49e3e3")
texto_sub1.place(relx=0.2, rely=0.25)

valor = StringVar()
valor_entrada = Entry(textvariable=valor,
                      font=("Arial", "12", "bold"),
                      bg="white", fg="blue", justify='center')
valor_entrada.place(relx=0.55, rely=0.26, relwidth=0.35)
def app():
    try:
        v = float(valor.get())
        if var == "hertz (hz)":
            bpm = v * 60
            mensagem = f"{v} Hz = {bpm} BPM"
        if  var == "Beats por minuto (bpm)":
            hz= v/60
            mensagem = f"{v} BPM = {hz} Hz"

        resultado_texto.config(text=mensagem)
    except ValueError:
        resultado_texto.config(text="")

def limpar():
    valor_entrada.delete()

but1 = Button(text="Calcular", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=app)
but1.place(relx=0.1, 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=0.4, 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=0.7, rely=0.65, relwidth=0.25, relheight=0.1)
resultado_texto = Label(text="",
                        font=("Arial", 12, "bold"), bg="#cfe2f3")
resultado_texto.place(relx=0.05, rely=0.8, relwidth=0.9, relheight=0.15)

root.mainloop()