Python3 how to clear previous prints while looping, flush?

Question

I want to show only one item at the screen I guess this should be done with print(..., flush=True) but it don't work as I expected.

for i in range(0,100):
    print(i, end='', flush=True)

Now I get a numbers like this 012345678.... and what I want to see at the screen is only one number without seeing previous prints so with first iteration it shows only 0 second shows only 1, I thought flush would do the trick but it didn't so where am I wrong?

Does this answer your question? [Replace console output in Python](https://stackoverflow.com/questions/6169217/replace-console-output-in-python) — bluefish, Dec 16 '20 at 19:45

score 5 · Accepted Answer · answered Dec 16 '20 at 19:49

5

You can use end='\r' as an argument to print(). \r escape sequence moves the cursor to the starting of the line. flush is not the correct argument for doing this.

Your code can be:

for i in range(0,100):
    print(i, end='\r')

answered Dec 16 '20 at 19:49

Sumagna Das

66
3

May I ask why flush isn't correct argument? – StrudzonyWedrowiec Dec 16 '20 at 19:55
And if you don't mind what if I have string that is getting smaller? How would I this? – StrudzonyWedrowiec Dec 16 '20 at 20:08
2

@StrudzonyWedrowiec Then add spaces to the string – Matthias Dec 16 '20 at 20:50
Ok I get it now, thank you, very much – StrudzonyWedrowiec Dec 16 '20 at 21:42

score 1 · Answer 2 · answered Dec 16 '20 at 19:50

1

You can make use of os module to do the same

import os
import time

for i in range(100):
    print(i)
    time.sleep(1)
    os.system("clear") # For Linux
    #os.system("cls") # For Windows

I have used time.sleep() to make sure the effect is visible otherwise it executes very fast. You may make variations as per the need.

answered Dec 16 '20 at 19:50

Tanishq Vyas

1,422
1
12
25

1

I was aware of that but I was looking for solution similar as bluefish and Sumagna Das posted – StrudzonyWedrowiec Dec 16 '20 at 19:56

Python3 how to clear previous prints while looping, flush?

2 Answers2