Fuso horário

import pytz
import datetime
import time
from datetime import datetime
# Todos os fusos horários
#a =pytz.all_timezones
#print(a)

def lisboa():
    tzLisbon = pytz.timezone('Europe/Lisbon')
    ct1 = datetime.now(tz=tzLisbon)
    print(ct1.strftime('%H:%M:%S'))

def acores():
    tzazores = pytz.timezone('Atlantic/Azores')
    ct2 = datetime.now(tz=tzazores)
    print(ct2.strftime('%H:%M:%S'))
def newyork():
    tznewyork = pytz.timezone('America/New_York')
    ct3 = datetime.now(tz=tznewyork)
    print(ct3.strftime('%H:%M:%S'))
def berlin():
    tzberlim = pytz.timezone('Europe/Berlin')
    ct5 = datetime.now(tz=tzberlim)
    print(ct5.strftime('%H:%M:%S'))
def seul():
    tzseul = pytz.timezone('Asia/Seoul')
    ct6 = datetime.now(tz=tzseul)
    print(ct6.strftime('%H:%M:%S'))

def usacentral ():
    tzcentral = pytz.timezone('US / Central')
    ct7 = datetime.now(tz=tzcentral)
    print(ct7.strftime('%H:%M:%S'))

def australia ():
    tzaustralia = pytz.timezone('Australia/Sydney')
    ct8 = datetime.now(tz=tzaustralia)
    print(ct8.strftime('%H:%M:%S'))

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: Hora de Lisboa
                B: Hora de Açores
                C: Hora de Berlim
                D: Hora de New York
                E: Hora de EUA/Central
                F: Hora de Seul
                H: Hora de Austrália          
                I: Sair
                Escolha uma hipótese: 
    """)
    escolha = escolha.lower()
    if escolha == 'a':
        lisboa()
        time.sleep(5)
        menu()
    elif escolha == 'b':
        acores()
        time.sleep(5)
        menu()
    elif escolha == 'c':
        berlin()
        time.sleep(5)
        menu()
    elif escolha == 'd':
        newyork()
        time.sleep(5)
        menu()
    elif escolha == 'e':
        usacentral()
        time.sleep(5)
        menu()
    elif escolha == 'f':
        seul()
        time.sleep(5)
        menu()
    elif escolha == 'h':
        australia()
        time.sleep(5)
        menu()
    elif escolha == 'i':
        time.sleep(5)
        sair()
    else:
        print("Erro na Tecla!")
        print("Por favor, escolha novamente.")
        menu()
menu()