print is not real-time

[Almenon]

from time import sleep
from datetime import datetime

x=0

while(x<2):
    x = x+1
    sleep(2)
    print(datetime.now())    
      

prints should come in with a gap of 2 seconds but instead they come in all at once at the end

[Almenon]

i found the answer in extrabacon/python-shell#103

I need to use -u to disable buffering of output