CODEWITHSUNDEEP
pythonsleep
UserThatProgram'sHorribly
UserThatProgram'sHorribly

Reputation: 27

time.sleep function hiding text until KeyboardInterrupt

When I use sleep in while True it's showing nothing until I do keyboard interrupt.

Here's my code:

from colorama import Back
from time import sleep
while True:
    print(Back.RED +'Lol' ,sep=" " ,end=" ")
    sleep(0.2)

Output:

 |py
 |c:/.../colograma.py
 |

It's empty...

When I do Ctrl-C it shows this:

Lol Lol Lol Lol Lol Lol Lol Lol Lol Lol Lol Lol Lol Lol Lol Traceback 
 (most recent call last):
  File "c:/Users/blabl/Desktop/LukaOzbijan/colograma.py", line 5, in 
 <module>
        sleep(0.2)
        KeyboardInterrupt

Upvotes: 0

Views: 172

Answers (1)

chepner
chepner

Reputation: 532333

Output is buffered, and nothing is actually written to standard output until the buffer fills up. Add flush=True to output text immediately.

print(Back.RED + 'Lol', end=" ", flush=True)

(sep isn't needed because you only have one string being written per call to print.)

Upvotes: 3

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