Python time.sleep method not working properly

Question

I have written this small code in Python. It should print every character in a string with a small sleeptime between them...

import time, sys

def writeText(string, t):
    i = 0
    while i < len(string):
        sys.stdout.write(string[i])
        time.sleep(float(t))
        i += 1

writeText("Hello World", 0.5)

but it only prints the whole string after 0.5 seconds... I often have this issue but I haven't found a solution yet.

score 3 · Accepted Answer · answered Jan 05 '18 at 08:26

3

sys.stdout.flush() might solve your problem.

import time, sys

def writeText(string, t):
    i = 0
    while i < len(string):
        sys.stdout.write(string[i])
        time.sleep(float(t))
        i += 1
        sys.stdout.flush()

writeText("Hello World", 0.5)

answered Jan 05 '18 at 08:26

dkato

895
10
28

Thank you! Code is working fine now.. – Jan 05 '18 at 08:30

score 3 · Answer 2 · answered Jan 05 '18 at 08:27

3

You should add

sys.stdout.flush()

after writing, to force the output of the text.

answered Jan 05 '18 at 08:27

clemens

16,716
11
50
65

1

Thank you code is working fine now! – Jan 05 '18 at 08:30

Python time.sleep method not working properly

2 Answers2