Python 进度条 [英] Python Progress Bar

问题描述

当我的脚本正在执行一些可能需要时间的任务时，如何使用进度条?

How do I use a progress bar when my script is doing some task that is likely to take time?

例如，需要一些时间才能完成并在完成后返回 True 的函数.如何在函数执行期间显示进度条?

For example, a function which takes some time to complete and returns True when done. How can I display a progress bar during the time the function is being executed?

请注意，我需要这是实时的，所以我不知道该怎么做.为此我需要一个 thread 吗?我不知道.

Note that I need this to be in real time, so I can't figure out what to do about it. Do I need a thread for this? I have no idea.

现在我在执行函数时没有打印任何内容，但是进度条会很好.此外，我对如何从代码的角度完成这项工作更感兴趣.

Right now I am not printing anything while the function is being executed, however a progress bar would be nice. Also I am more interested in how this can be done from a code point of view.

推荐答案

有特定的库(像这个在这里)但也许可以做一些非常简单的事情:

There are specific libraries (like this one here) but maybe something very simple would do:

import time
import sys

toolbar_width = 40

# setup toolbar
sys.stdout.write("[%s]" % (" " * toolbar_width))
sys.stdout.flush()
sys.stdout.write("\b" * (toolbar_width+1)) # return to start of line, after '['

for i in xrange(toolbar_width):
    time.sleep(0.1) # do real work here
    # update the bar
    sys.stdout.write("-")
    sys.stdout.flush()

sys.stdout.write("]\n") # this ends the progress bar

注意:progressbar2 是 progressbar 多年未维护.

Note: progressbar2 is a fork of progressbar which hasn't been maintained in years.

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