Python: significance of -u option?

Question

I am noticed in some python code that -u is used to start the python interpreter. I looked at the man page for python but I could not get much out of it. Please give me som

Answer 1

Python is optimised for reading in and printing out lots of data. One of these optimisation is that the standard input and output of the Python interpreter are buffered. That means that whenever a program tries to use one of those streams, the interpreted will block up the usage into large chunks and then send the chunks all in one go. This is faster than sending each individual read/write through separately, but obviously has the disadvantage that data can get 'stopped up' in the middle.

The -u flag turns off this behaviour.