Diary v2

import os.path
import datetime

def today():
    return str(datetime.date.today())

def diary_file_path():
    script_dir = os.path.dirname(__file__)
    return os.path.join(script_dir, 'diary.txt')

def ask_for_input():
    content = input("What do you want to say to Mr. Diary? ")
    if len(content) > 0:
        write_file(today() + ": " + content)

def write_file(content):
    with open(diary_file_path(), "a") as file_obj:
        file_obj.write(content + "\n")

def read_last_entries():
    with open(diary_file_path(), "r") as file_obj:
        lines = file_obj.readlines()
        print("".join(lines[-3:]).rstrip())

ask_for_input()
read_last_entries()