Bitcoin (Terminal)

import urllib.request, json, time
def bitdolar():
    url = "http://api.coindesk.com/v1/bpi/currentprice.json"
    with urllib.request.urlopen(url) as url:
        response = url.read()
        data = json.loads(response.decode('utf-8'))
        valor = float(data['bpi']['USD']['rate'].replace(",", ""))
        print(f'Um Biicoin vale {round(valor,2)} dólares')
    return valor
def biteuro():
    url = "http://api.coindesk.com/v1/bpi/currentprice.json"
    with urllib.request.urlopen(url) as url:
        response = url.read()
        data = json.loads(response.decode('utf-8'))
        valor = float(data['bpi']['EUR']['rate'].replace(",", ""))
        print(f'Um Biicoin vale {round(valor,2)} euros')
    return valor

def sair ():
    print("***********************\n")
    print("\tFim Do Programa")
    print("***********************\n")
    quit()

def menu():
    print("\n\t\t*********************************************************"
          "\n\t\t\t\t\t\t\t\tMenu Principal"
          "\n\t\t*********************************************************")
    escolha = input(""" 
                A: Bicoin --> Dólares
                B: Bicoin --> Euros
                D: Sair
                Escolha uma hipótese: 
    """)
    escolha = escolha.lower()
    if escolha == 'a':
        bitdolar()
        time.sleep(6)
        menu()
    elif escolha == 'b':
        biteuro()
        time.sleep(6)
        menu()
    elif escolha == 'c':
        time.sleep(5)
        sair()
    else:
        print("Erro na Tecla!")
        print("Por favor, escolha novamente.")
        menu()
menu()