将python代码的stdout重定向到文件而无需让python使其保持锁定状态

Question

I am trying the most simple method of redirecting the stdout of a python code to a file using a command such as below.

python foo.py > SmokeyStover.log

This works fine except I need to stop my python code to be able to read the added logs into this log file and the result for commands such as

tail -f SmokeyStover.log 

while the code is running, using the python interpreter, is no incoming logs in the real time stream of logs getting appended to this file continuously.

I also used other approaches to redirect the stdio inside the python code using commands such as following and the file simply doesn't get flushed.

sys.stdout = open('SmokeyStover.log', 'a')

Answer 1

Probably you will have to flush the buffer manually, for instance:

import sys
import time


for i in range(100):
    print "number is %s " %i
    time.sleep(1)
    sys.stdout.flush()