Core Python Programming

9.5. Standard Files

There are generally three standard files which are made available to you when your program starts. These are standard input (usually the keyboard), standard output (buffered output to the monitor or display), and standard error (unbuffered output to the screen). (The “buffered” or “unbuffered” output refers to that third argument to open()). These files are named stdin, stdout, and stderr and take after their names from the C language. When we say these files are “available to you when your program starts,” that means that these files are pre-opened for you, and access to these files may commence once you have their file handles.

Python makes these file handles available to you from the sys module. Once you import sys, you ...