I have a Python script and I want to make it display a increasing number from 0 to 100% in the terminal. I know how to print the numbers on the terminal but how can I "rewrite" them so 0 turns into 1, 1 into 2, and so on until 100?
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4 Answers
Printing a carriage return (\r) without a newline resets the cursor to the beginning of the line, making the next print overwriting what's already printed:
import time
import sys
for i in range(100):
print i,
sys.stdout.flush()
time.sleep(1)
print "\r",
This doesn't clear the line, so if you try to, say, print decreasing numbers using this methods, you'll see leftover text from previous prints. You can work around this by padding out your output with spaces, or using some of the control codes in the other answers.
4 Comments
Federico klez Culloca
is this platform independent?
Muhammad Alkarouri
@klez: probably not for all terminals. It works for typewriters. Is that platform independent enough for you? :)
Benjamin Wohlwend
On the two platforms at my disposal (Linux and Windows), it works.
Muhammad Alkarouri
I don't have access to Windows at the moment. Can you please test if the recipe in my answer works there? If you don't have the time don't bother, I am sure I will come across a Windows machine soon.
This recipe here should prove useful. Using that module as tc, the following code does what you want:
from tc import TerminalController
from time import sleep
import sys
term = TerminalController()
for i in range(10):
sys.stdout.write("%3d" % i)
sys.stdout.flush()
sleep(2)
sys.stdout.write(term.BOL + term.CLEAR_EOL)
The recipe uses terminfo to get information about the terminal and works in Linux and OS X for a number of terminals. It does not work on Windows, though. (Thanks to piquadrat for testing, as per the comment below).
Edit: The recipe also gives capabilities for using colours and rewriting part of the line. It also has a ready made text progress bar.
answered Aug 15, 2010 at 18:46
Muhammad Alkarouri
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2 Comments
Benjamin Wohlwend
as requested, I tried your code on Windows (Windows 7, Python 2.7). Output is " 0 1 2 3 4 5 6 7 8 9".
conny
Pulling in terminfo is overly complex for something as basic as send carriage return, but I give a thumbs-up anyway for correctness :)
Using the blessings package - clear your screen (clear/cls) and enter:
import sys
from blessings import Terminal
from time import sleep # <- boy, does this sound tempting a.t.m.
term = Terminal()
for i in range(6):
with term.location(term.width - 3, term.height - 3):
print('{}'.format(i))
sleep(2)
if (i == 3):
print('what was I doing, again?')
print('done')
To install it from CheeseShop, just...
pip install blessings
Comments
Based on this answer, but without the terminal controller:
import time
import sys
for i in range(100):
sys.stdout.write("Downloading ... %s%%\r" % (i))
sys.stdout.flush()
time.sleep(1)
Tested on GNOME terminal (Linux) and Windows console.
Tip: Don't run this example in IDLE editor.
