To implement a status bar like below:
[========== ] 45% [================ ] 60% [==========================] 100%
I want to this to be printed out to stdout, and keep refreshing it, not print to another line. How to do this?
There's a Python module that you can get from PyPI called
progressbar that implements such functionality. If you don't mind adding a dependency, it's a good solution. Otherwise, go with one of the other answers.
A simple example of how to use it:
import progressbar from time import sleep bar = progressbar.ProgressBar(maxval=20, \ widgets=[progressbar.Bar('=', '[', ']'), ' ', progressbar.Percentage()]) bar.start() for i in xrange(20): bar.update(i+1) sleep(0.1) bar.finish()
To install it, you can use
easy_install progressbar, or
pip install progressbar if you prefer pip.
'\r' character (carriage return) resets the cursor to the beginning of the line and allows you to write over what was previously on the line.
from time import sleep import sys for i in range(21): sys.stdout.write('\r') # the exact output you're looking for: sys.stdout.write("[%-20s] %d%%" % ('='*i, 5*i)) sys.stdout.flush() sleep(0.25)
I'm not 100% sure if this is completely portable across all systems, but it works on Linux and OSX at the least.