472,356 Members | 2,022 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 472,356 software developers and data experts.

Unbuffered stdout/auto-flush

Hi, is there any way to get unbuffered stdout/stderr without relying on
the -u flag to python or calling .flush() on each print (including
indirect hacks like replacing sys.stdout with a wrapper that succeeds
each write() with a flush())? Thanks in advance!
Yang Zhang
Jun 27 '08 #1
1 4453
On Jun 21, 12:29 pm, Yang Zhang <yanghates...@gmail.comwrote:
Hi, is there any way to get unbuffered stdout/stderr without relying on
the -u flag to python or calling .flush() on each print (including
indirect hacks like replacing sys.stdout with a wrapper that succeeds
each write() with a flush())? Thanks in advance!
I think the only way is to reopen the stdout file descriptor:

import sys
import os

# reopen stdout file descriptor with write mode
# and 0 as the buffer size (unbuffered)
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)

print "unbuffered text"

Jun 27 '08 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Seong Jin, Cho | last post by:
Hi. Is there a way to get an unbuffered InputStream from Process? I found out that java.lang.Win32Process and java.lang.UNIXProcess both wraps the stdout with java.io.BufferedInputStream, but...
by: Max Rabkin | last post by:
While java's System.in is, according to the javadocs, an InputStream, it is in fact an instance of java.io.BufferedInputStream. Is there any way to have unbuffered access to it without hacking the...
by: Rich | last post by:
Does anyone know the correct way of opening an unbuffered output file using STL? I attempted: ofstream myfile("fname.txt", ios::binary); myfile.setbuf(NULL, 0); and I was informed that...
by: | last post by:
Is this even possible? I've found some references to specific "unbuffered" type methods that exist in older incarnations of basic_streambuf but not in newer ones. Info please. :P
by: Lonnie Princehouse | last post by:
>From the cmd shell on both Windows 2k and XP, I'm getting this weird syntax error in conjunction with the unbuffered flag. It works fine without -u. Has anyone else encountered it? This didn't...
by: pank7 | last post by:
hi everyone, I have a program here to test the file IO(actually output) with buffer turned on and off. What I want to see is that there will be obvious differece in time. Here I have an input...
by: Santtu Nyrhinen | last post by:
Hi, Let say that I have a function like void writeHello() { printf("Hello"); } Now I need to make an automated test fot that function. The test function returns 1 for successful and 0 for...
by: Sebouh | last post by:
Hi all. I was wondering if ther was a function call that prints to the stdout directly, without buffering the output. You see, i'm working with processes in linux, and i need to print stuff to the...
by: Joakim Hove | last post by:
Hello, I have written a program in C; this programs uses an external proprietary library. When calling a certain function in the external library, the particular function writes a message to...
by: zeeshan708 | last post by:
what is the difference between the buffered and unbuffered stream ??(e.g we say that cout is buffered and cerr is unbuffered stream) does that mean that the output sent to buffered stream have to go...
by: antdb | last post by:
Ⅰ. Advantage of AntDB: hyper-convergence + streaming processing engine In the overall architecture, a new "hyper-convergence" concept was proposed, which integrated multiple engines and...
by: Matthew3360 | last post by:
Hi there. I have been struggling to find out how to use a variable as my location in my header redirect function. Here is my code. header("Location:".$urlback); Is this the right layout the...
by: Arjunsri | last post by:
I have a Redshift database that I need to use as an import data source. I have configured the DSN connection using the server, port, database, and credentials and received a successful connection...
by: WisdomUfot | last post by:
It's an interesting question you've got about how Gmail hides the HTTP referrer when a link in an email is clicked. While I don't have the specific technical details, Gmail likely implements measures...
by: Matthew3360 | last post by:
Hi, I have been trying to connect to a local host using php curl. But I am finding it hard to do this. I am doing the curl get request from my web server and have made sure to enable curl. I get a...
by: Oralloy | last post by:
Hello Folks, I am trying to hook up a CPU which I designed using SystemC to I/O pins on an FPGA. My problem (spelled failure) is with the synthesis of my design into a bitstream, not the C++...
by: Carina712 | last post by:
Setting background colors for Excel documents can help to improve the visual appeal of the document and make it easier to read and understand. Background colors can be used to highlight important...
by: BLUEPANDA | last post by:
At BluePanda Dev, we're passionate about building high-quality software and sharing our knowledge with the community. That's why we've created a SaaS starter kit that's not only easy to use but also...
by: Rahul1995seven | last post by:
Introduction: In the realm of programming languages, Python has emerged as a powerhouse. With its simplicity, versatility, and robustness, Python has gained popularity among beginners and experts...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.