Question

Following the description given here how to create output in python in such a way, that the previous output is overwritten, I tried the following code

from __future__ import print_function
import time

for val in range(10):
    time.sleep(0.2)
    print(val, end='\r')

but do not see any output at all. With end=\n it works as expected (i.e. the numbers 0 to 9 in a vertical column). What is the reason I do not see any output? Do I need to flush something? Is this operating-system depended (working on Ubuntu Linux)?

Answer 1

I guess that the stream isn’t flushed until it gets a ‘\n’.

Have a look at this article: Disable output buffering

Try if it works when you start Python with -u.