Why does print run only after executing for loop in Python

+1 vote

Suppose I have a for loop. 

for i in range(10):
    print(i)

So now instead of printing the numbers from 0 to 9 one by one, python waits and prints them all at once. I want to know why is this happening. 

Aug 1, 2019 in Python by Arvind
• 3,040 points
297 views

1 answer to this question.

+1 vote

Your stdout is line-buffered; this means that it won't show the text until a newline is encountered. To solve this, you need to explicitly flush the buffer.

import sys
for i in range(10):
    print(i)
sys.stdout.flush()
answered Aug 1, 2019 by Neel
• 3,020 points

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