替换 Python 中的控制台输出 [英] Replace console output in Python

问题描述

我想知道如何像在某些 C/C++ 程序中那样在 Python 中创建那些漂亮的控制台计数器之一.

I'm wondering how I could create one of those nifty console counters in Python as in certain C/C++-programs.

我有一个循环做事，当前的输出是这样的:

I've got a loop doing things and the current output is along the lines of:

Doing thing 0
Doing thing 1
Doing thing 2
...

只更新最后一行会更整洁；

what would be neater would be to just have the last line update;

X things done.

我已经在许多控制台程序中看到过这种情况，我想知道我是否/如何在 Python 中做到这一点.

I've seen this in a number of console programs and am wondering if/how I'd do this in Python.

推荐答案

一个简单的解决方案是在字符串前写"\r"而不是添加换行符；如果字符串永远不会变短，这就足够了...

An easy solution is just writing "\r" before the string and not adding a newline; if the string never gets shorter this is sufficient...

sys.stdout.write("\rDoing thing %i" % i)
sys.stdout.flush()

稍微复杂一点的是进度条......这是我正在使用的东西:

Slightly more sophisticated is a progress bar... this is something I am using:

def startProgress(title):
    global progress_x
    sys.stdout.write(title + ": [" + "-"*40 + "]" + chr(8)*41)
    sys.stdout.flush()
    progress_x = 0

def progress(x):
    global progress_x
    x = int(x * 40 // 100)
    sys.stdout.write("#" * (x - progress_x))
    sys.stdout.flush()
    progress_x = x

def endProgress():
    sys.stdout.write("#" * (40 - progress_x) + "]\n")
    sys.stdout.flush()

你调用 startProgress 传递操作的描述，然后 progress(x) 其中 x 是百分比，最后 endProgress()

You call startProgress passing the description of the operation, then progress(x) where x is the percentage and finally endProgress()

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