[Tutor] "Print" behaviour inside a loop?
maxnoel_fr at yahoo.fr
Sun Jun 12 01:50:40 CEST 2005
On Jun 12, 2005, at 00:42, Simon Gerber wrote:
> Any hints? I looked up the python reference manual, but couldn't find
> any way to force print statements to draw. Should I be looking into
> threads, perhaps?
I/O in Python is buffered -- that is, it uses RAM whenever
possible to delay the actual reading/writing operations, which in
turn speeds them up. For example, when you read a character from a
file, a larger part of the file is stored in a RAM buffer so as to
speed up subsequent calls.
In the same way, whenever you write to stdout (or to a file),
everything is stored in a buffer until a newline is reached or the
buffer is manually flushed. The latter is what you're looking for,
it's done by calling the file object's (in your case, stdout --
remember, on UNIX everything is a file) flush method.
Here's a small example:
import time, sys
for i in xrange(20):
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