我编写了一个简单的控制台应用程序,使用ftplib从FTP服务器上传和下载文件。

我想应用程序显示一些可视化的下载/上传进度为用户;每次下载数据块时,我希望它提供一个进度更新,即使它只是一个数字表示,如百分比。

重要的是,我想避免擦除之前打印到控制台的所有文本(即,我不想在打印更新的进度时“清除”整个终端)。

这似乎是一个相当常见的任务——我如何才能制作一个进度条或类似的可视化输出到我的控制台,同时保留之前的程序输出?


当前回答

对于python 3:

def progress_bar(current_value, total):
    increments = 50
    percentual = ((current_value/ total) * 100)
    i = int(percentual // (100 / increments ))
    text = "\r[{0: <{1}}] {2}%".format('=' * i, increments, percentual)
    print(text, end="\n" if percentual == 100 else "")

其他回答

我写了一个简单的进度条:

def bar(total, current, length=10, prefix="", filler="#", space=" ", oncomp="", border="[]", suffix=""):
    if len(border) != 2:
        print("parameter 'border' must include exactly 2 symbols!")
        return None

    print(prefix + border[0] + (filler * int(current / total * length) +
                                      (space * (length - int(current / total * length)))) + border[1], suffix, "\r", end="")
    if total == current:
        if oncomp:
            print(prefix + border[0] + space * int(((length - len(oncomp)) / 2)) +
                  oncomp + space * int(((length - len(oncomp)) / 2)) + border[1], suffix)
        if not oncomp:
            print(prefix + border[0] + (filler * int(current / total * length) +
                                        (space * (length - int(current / total * length)))) + border[1], suffix)

正如你所看到的,它有:条的长度,前缀和后缀,填充,空间,文本在条上100%(oncomp)和边界

这里有一个例子:

from time import sleep, time
start_time = time()
for i in range(10):
    pref = str((i+1) * 10) + "% "
    complete_text = "done in %s sec" % str(round(time() - start_time))
    sleep(1)
    bar(10, i + 1, length=20, prefix=pref, oncomp=complete_text)

正在进行中:

30% [######              ]

Out on complete:

100% [   done in 9 sec   ] 

http://code.activestate.com/recipes/168639-progress-bar-class/ (2002) http://code.activestate.com/recipes/299207-console-text-progress-indicator-class/ (2004) http://pypi.python.org/pypi/progressbar (2006)

还有很多教程等着你去谷歌。

在Python命令行运行这个命令(不是在任何IDE或开发环境中):

>>> import threading
>>> for i in range(50+1):
...   threading._sleep(0.5)
...   print "\r%3d" % i, ('='*i)+('-'*(50-i)),

在我的Windows系统上运行良好。

python终端进度条代码

import sys
import time

max_length = 5
at_length = max_length
empty = "-"
used = "%"

bar = empty * max_length

for i in range(0, max_length):
    at_length -= 1

    #setting empty and full spots
    bar = used * i
    bar = bar+empty * at_length

    #\r is carriage return(sets cursor position in terminal to start of line)
    #\0 character escape

    sys.stdout.write("[{}]\0\r".format(bar))
    sys.stdout.flush()

    #do your stuff here instead of time.sleep
    time.sleep(1)

sys.stdout.write("\n")
sys.stdout.flush()

Tqdm:在你的循环中添加一个进度表:

>>> import time
>>> from tqdm import tqdm
>>> for i in tqdm(range(100)):
...     time.sleep(1)
... 
|###-------| 35/100  35% [elapsed: 00:35 left: 01:05,  1.00 iters/sec]