Calling time.sleep () after the print function with the argument end does not print

problem

I want to display the numbers from 0 to 9 every second.

count.py

# -*- coding: utf-8 -*-
import time

i = 0
while(i<9):
    print(i, end='')
    time.sleep(1)
    i+=1

Run.

% python3 count.py

... that, nothing is printed and nothing happens after a few seconds ...

As a test

count.py

# -*- coding: utf-8 -*-
import time

i = 0
while(i<10):
    print(i)
    time.sleep(1)
    i+=1

(Try deleting the argument ʻend`),

% python3 count.py
0
1
2
3
4
5
6
7
8
9
%

Displayed every second. However, I want to specify ʻend` ...

Solution

Have the argument flush.

count.py

# -*- coding: utf-8 -*-
import time

i = 0
while(i<10):
    print(i, end='', flush=True)
    time.sleep(1)
    i+=1

When I run it,

% python3 count.py
0123456789%

It went well.