最后输出行上方的Python输出 [英] Python output above the last printed line

问题描述

在python中，有没有一种方法可以在命令行的最后一行上方打印某些内容?或者，与我要实现的目标类似，保持最后一行不变，即不要覆盖它.

Is there a way in python to print something in the command line above the last line printed? Or, similarly to what I want to achieve, remain the last line intact, that is, not overwrite it.

这样做的目的是让命令行的最后一行成为状态/百分比栏.

The goal of this is to let the last line in the command line a status/precentage bar.

输出示例:

File 1 processed
(0.1% Completed)

下次刷新:

File 1 processed
File 2 processed
(0.2% Completed)

下次刷新:

File 1 processed
File 2 processed
File 3 processed
(0.3% Completed)

推荐答案

from time import sleep
erase = '\x1b[1A\x1b[2K'

def download(number):
    print(erase + "File {} processed".format(number))

def completed(percent):
    print("({:1.1}% Completed)".format(percent))

for i in range(1,4):
    download(i)
    completed(i/10)
    sleep(1)

在我的python 3.4中工作，最终输出是:

Works in my python 3.4, final output is:

File 1 processed
File 2 processed
File 3 processed
(0.3% Completed)

如果您想了解有关终端转义码的更多信息，请尝试: https://en.wikipedia.org/wiki/ANSI_escape_code

If you want read more about terminal escape codes try: https://en.wikipedia.org/wiki/ANSI_escape_code

根据要求，带有空格的示例:

As requested, example with a space:

from time import sleep
erase = '\x1b[1A\x1b[2K'

def download(number):
    print(erase*2 + "File {} processed".format(number))

def completed(percent):
    print("\n({:1.1}% Completed)".format(percent))

print("\n(0.0% Completed)")
for i in range(1,5):
    download(i)
    completed(i/10)
    sleep(1)

最终输出是:

File 1 processed
File 2 processed
File 3 processed
File 4 processed

(0.4% Completed)

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