Refresh output line containing download percentage [duplicate]

This question already has answers here: How to print out status bar and percentage? (23 answers) Closed 8 years ago.

I'm writing a script that has to download several files from the www. To make it more expressive I've just added a download hook to calculate the downloading percentage of the file that has being downloaded. Printing it out on the terminal produces a lot of output because I rewrite the same line each time the percentage counter is increm开发者_如何转开发ented, example:

1% - Downloading test.jpg
2% - Downloading test.jpg
... and so on

I'd like to obtain something like many bash scripts or programs (such as "apt-get" from ubuntu): refresh the line containing the percentage without have to write several times the same line containing the the updated percentage.

How can I do that? Thanks.

[edit] I'm using Python3.2 to develop the file downloader.

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You need curses:

http://docs.python.org/howto/curses.html

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Use \r (carriage return) and write directly to the terminal with sys.stdout.write:

import time
import sys
for i in range(101):
    sys.stdout.write('%3d%%\r' % i)
    time.sleep(.1)

Or a little more Python 3-ish:

import time
for i in range(101):
    print('{:3}%'.format(i),end='\r')
    time.sleep(.1)