from sys import argv, stdout as cout
from time import sleep as sl
print("Rewinding.......",end = '') # If end is given output isn't flushed. But why?
cout.flush()
for i in range(0,20):
sl(0.2)
print(".",end='',flush = True) #No output is printed if flush wasn't specified as true.
print("Done") #Output is by default flushed here
When I specified end and sleep, I noticed that output wasn't flushed until next print where it was by default flushed.
Why does this happen? I had to manually flush the output.
In fact this is the default behavior of the underlying stdio functions.
When the output is to console, the stream will be automatically flushed when a newline is encountered, but not other characters.
If the output is not a console, then even newline won't trigger a flush.
If you want to make sure about flush, you can tell the print() explicitly:
print("Rewinding.......",end = '',flush=True)