#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Sat Jul 11 15:10:16 2020

@author: yujiang
"""
import datetime

def hello_world():
    "hello world print"
    today = datetime.date.today()
    to_string =  "hello world in {}".format(to_string)
    print(to_string)
    return to_string 