March 2003
Intermediate to advanced
656 pages
39h 30m
English
Content preview from Python in a NutshellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Name
open
Synopsis
open(file,flags,mode=0777)
Returns a file descriptor, opening or creating a file named
file. If open creates
the file, it uses mode as the
file’s permission bits.
flags is an int,
normally obtained by bitwise ORing one or more of the following
attributes of os:
-
O_RDONLY,O_WRONLY,O_RDWR Opens
filefor read-only, write-only, or read-write respectively (mutually exclusive: exactly one of these attributes must be inflags)-
O_NDELAY,O_NONBLOCK Opens
filein non-blocking (no-delay) mode, if the platform supports this-
O_APPEND Appends any new data to
file’s previous contents-
O_DSYNC,O_RSYNC,O_SYNC,O_NOCTTY Sets synchronization mode accordingly, if the platform supports this
-
O_CREAT Creates
file, iffiledoes not already exist-
O_EXCL Raises an exception if
filealready exists-
O_TRUNC Throws away previous contents of
file(incompatible withO_RDONLY)-
O_BINARY Open
filein binary rather than text mode on non-Unix platforms (innocuous and without effect on Unix and Unix-like platforms)
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.