Python is an interpreted, interactive, object-oriented programming language that combines remarkable power with very clear syntax. For an introduction to programming in Python you are referred to the Python Tutorial. The Python Library Reference documents built-in and standard types, constants, functions and modules. Finally, the Python Reference Manual describes the syntax and semantics of the core language in (perhaps too) much detail.
Turn on parser debugging output (for wizards only, depending on compilation options).
When a script is passed as first argument or the -c option is used, enter interactive mode after executing the script or the command. It does not read the $PYTHONSTARTUP file. This can be useful to inspect global variables or a stack trace when a script raises an exception.
Turn on basic optimizations. This changes the filename extension for compiled (bytecode) files from .pyc to pyo.
Disable the import of the module site and the site-dependent manipulations of sys.path that it entails.
Issue a warning when a source file mixes tabs and spaces for indentation in a way that makes it depend on the worth of a tab expressed in spaces. Issue an error when the option is given twice.
Force stdin, stdout and stderr to be totally unbuffered.
Print a message each time a module is initialized, showing the place (filename or built-in module) from which it is loaded.
Skip the first line of the source. This is intended for a DOS specific hack only. Warning: the line numbers in error messages will be off by one!
Make the standard exceptions strings instead of classes. Use for backward compatibility with old code only.
The interpreter interface resembles that of the UNIX shell: when called with standard input connected to a tty device, it prompts for commands and executes them until an EOF is read; when called with a file name argument or with a file as standard input, it reads and executes a script from that file; when called with -c command, it executes the Python statement(s) given as command. Here command may contain multiple statements separated by newlines. Leading whitespace is significant in Python statements! In non-interactive mode, the entire input is parsed befored it is executed.
If available, the script name and additional arguments thereafter are passed to the script in the Python variable sys.argv , which is a list of strings (you must first import sys to be able to access it). If no script name is given, sys.argv is empty; if -c is used, sys.argv[0? contains the string '-c'. Note that options interpreted by the Python interpreter itself are not placed in sys.argv.
These are subject to difference depending on local installation conventions:
Recommended location of the interpreter.
Change the location of the standard Python libraries. By default, the libraries are searched in
Augments the default search path for module files. The format is the same as the shell's $PATH: one or more directory pathnames separated by colons. Non-existant directories are silently ignored. The default search path is installation dependent, but generally begins with sys.path .''
If this is the name of a readable file, the Python commands in that file are executed before the first prompt is displayed in interactive mode. The file is executed in the same name space where interactive commands are executed so that objects defined or imported in it can be used without qualification in the interactive session. You can also change the prompts sys.ps1 and sys.ps2 in this file.
If this is set to a non-empty string it is equivalent to specifying the -d option.
If this is set to a non-empty string it is equivalent to specifying the -i option.
If this is set to a non-empty string it is equivalent to specifying the -u option.
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, The Netherlands.
All Rights Reserved
Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the names of Stichting Mathematisch Centrum or CWI or Corporation for National Research Initiatives or CNRI not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission.
While CWI is the initial source for this software, a modified version is made available by the Corporation for National Research Initiatives (CNRI) at the Internet address ftp://ftp.python.org.