#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from datetime import datetime

with open("test.txt", "w") as f:
    f.write("今天是 ")
    f.write(datetime.now().strftime("%Y-%m-%d"))

with open("test.txt", "r") as f:
    s = f.read()
    print("open for read...")
    print(s)

with open("test.txt", "rb") as f:
    s = f.read()
    print("open as binary for read...")
    print(s)