如何使用此python脚本根据我的时区显示问候语？

import datetime
import pytz

def get_local_time(timezone):
    now = datetime.datetime.now(pytz.timezone(timezone))
    return now

def get_greeting(time):
    hour = time.hour
    if hour < 12:
        return "早上好！"
    elif hour < 18:
        return "下午好！"
    else:
        return "晚上好！"

timezone = input("请输入您的时区：")

local_time = get_local_time(timezone)

greeting = get_greeting(local_time)

print(greeting)