在Python中清除一行输出

Question

所以，我对Python和一般编程超级超级新手。我仍然在学习最基本的命令和术语。我的问题是我试图在无限循环中打印日期时间，但仅限于一行。

我希望shell中的输出显示日期和时间，然后清除以前显示的日期时间并将其替换为新值。我似乎无法弄清楚我错过了什么，并通过阅读不同的问题，似乎无法找到我要找的东西。任何想法，帮助或指导，将不胜感激。尝试阅读Python文档在这一点上根本没有帮助我。这是我已经想通了，到目前为止：

import datetime 
import time 

while True: 
    today = datetime.date.today() 
    now = datetime.datetime.now() 
    print ("The Current date is ", (today.strftime('%m/%d/%Y'))) 
    print ("The Current Time is ", (now.strftime('%H:%M'))) 
    time.sleep(30) 

这会产生：

The Current date is 03/28/2017 
The Current Time is 19:09 
The Current date is 03/28/2017 
The Current Time is 19:10 

我想它说：

The Current date is 03/28/2017 
The Current Time is 19:09 

然后，上面的文字删除，换成

The Current date is 03/28/2017 
The Current Time is 19:10 

日期时间截图

Answer 1

一种方法是使用ANSI escape sequences：

import datetime 
import time 
import sys 

while True: 
    today = datetime.date.today() 
    now = datetime.datetime.now() 
    print ("The Current date is ", (today.strftime('%m/%d/%Y'))) 
    print ("The Current Time is ", (now.strftime('%H:%M'))) 
    sys.stdout.write("\033[F") # Cursor up one line 
    sys.stdout.write("\033[F") # Cursor up one line 
    time.sleep(30) 

另一种选择：

进口日期时间 进口时间 进口OS

while True: 
    today = datetime.date.today() 
    now = datetime.datetime.now() 
    print ("The Current date is ", (today.strftime('%m/%d/%Y'))) 
    print ("The Current Time is ", (now.strftime('%H:%M'))) 
    time.sleep(30) 
    os.system('clear')