Python Progress Bar


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

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?

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.

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.

7/11/2016 4:14:50 PM

Accepted Answer

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

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

7/13/2019 8:40:16 PM

With tqdm you can add a progress meter to your loops in a second:

In [1]: import time

In [2]: from tqdm import tqdm

In [3]: for i in tqdm(range(10)):
   ....:     time.sleep(3)

 60%|██████    | 6/10 [00:18<00:12,  0.33 it/s]

Also, there is a graphical version of tqdm since v2.0.0 (d977a0c):

In [1]: import time

In [2]: from tqdm import tqdm_gui

In [3]: for i in tqdm_gui(range(100)):
  ....:     time.sleep(3)

tqdm gui window

But be careful, since tqdm_gui can raise a TqdmExperimentalWarning: GUI is experimental/alpha, you can ignore it by using warnings.simplefilter("ignore"), but it will ignore all warnings in your code after that.

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