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#1
January 26th, 2004, 11:15 PM
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How do I do a progress indicator in Python?
What's the model for creating a Python program that runs in a shell, that updates a line on the screen to indicate progress?
If I keep using print, then it will write a new line from the shell. What I want is something that looks like this: Code:
[ ] [= ] [== ] [=== ] [==== ] ... but so that each line overwrites the previous one? Thanks, Antun
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#3
January 27th, 2004, 01:37 AM
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what you're probabl looking for is curses although i'm not sure that is really a shell script since on windows we open a curses GUI window.
I'm sure strikes idea does work although i cant for teh life of me work out how to change prints end char right now so i'm just using sys.stdout to output the values. Anyway a few small examples... Code:
import sys, time
for each in range(5):
sys.stdout.write('[' + '=' * each + ']\r')
time.sleep(0.5)
or you can clear the crean (on windows) using the cls command (dont know about on *nix) Code:
import os, time
for each in range(5):
os.system('cls')
print '[' + '=' * each + ']'
time.sleep(0.5)
Mark.
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#5
January 27th, 2004, 11:11 AM
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Thanks guys! I like the first method that netytan posted the best (using carriage returns). Clearing the screen is not practical, because it means I'd lose anything else in the terminal.
-Antun
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#7
January 27th, 2004, 01:11 PM
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You can also use \b to move backwards one character at a time.
Code:
import sys
sys.stdout.write("Hello World")
sys.stdout.write("\b\b\b\b\bUniverse")
__________________
Up the Irons What Would Jimi Do? Smash amps. Burn guitar. Take the groupies home. "Death Before Dishonour, my Friends!!" - Bruce D ickinson, Iron Maiden Aug 20, 2005 @ OzzFest Down with Sharon Osbourne Puzzle of the Month solved by sizeablegrin, etienne141 and L7Sqr, superior C/C++ programmers of the month
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#8
January 27th, 2004, 01:30 PM
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Here's a twirly bar progress indicator:
Code:
class TwirlyBar:
def __init__(self):
import sys
self.__state = 0
self.__bar = ('|', '/', '-', '\\\')
def ShowProgress(self):
sys.stdout.write('\b' + self.__bar[self.__state])
self.__state = self.__state + 1
if self.__state > 3: self.__state = 0
if __name__ == "__main__":
import sys, time
sys.stdout.write ("Processing ... ")
tb = TwirlyBar()
for x in range(10):
tb.ShowProgress()
time.sleep(0.5)
sys.stdout.write("\bdone\n")
Last edited by Scorpions4ever : January 27th, 2004 at 01:54 PM.
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#9
January 27th, 2004, 01:52 PM
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Way, *nix style! Nice work scorpy, pretty sure you can do that more easily though
 will give it a try...Oh, the reason for this, you have an error or line 5, need to escape that backslash. Mark.
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#10
January 27th, 2004, 01:58 PM
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>> Oh, the reason for this, you have an error or line 5, need to escape that backslash.
I did escape the backslash in my code when I cut and pasted it here. The forum software is displaying only one backslash, but when you edit the code you can see the doubled backslash. The solution was to edit my thread and triple the backslashes, so that the forum software would then show a doubled backslash.  .>> Way, *nix style! Actually I tested this on a Windows box. Dunno if this will work on a *nix box unless I set the terminal to raw mode .
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#11
January 27th, 2004, 02:30 PM
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I think he meant it was *nix style.. you see that on *nix boxes often
 btw, I tried it on OS X, and it didn't work  Last edited by XxChris : January 27th, 2004 at 02:34 PM.
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#12
January 27th, 2004, 03:59 PM
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>> btw, I tried it on OS X, and it didn't work
Probably because you have to set output to be unbuffered. I couldn't get my code (or netytan's code either) to work, unless i started python with the -u option on my *nix box . Try doing it like this:python -u foo.py and see if it works.
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#13
January 27th, 2004, 05:08 PM
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Ok, here's my version of scorpies twirl class... only as a function and 4 x smaller (arpox)
Code:
#!/usr/bin/env python
import sys, time
def twirl(loops, chars = ('|', '/', '-', '\\\')):
for each in range(loops):
for char in chars:
sys.stdout.write(char + '\b')
time.sleep(0.2)
if __name__ == '__main__':
sys.stdout.write('Processing ... ')
twirl(10)
Mark. Last edited by netytan : January 27th, 2004 at 05:22 PM.
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#14
January 27th, 2004, 05:18 PM
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