Absolute newbie question
Fredrik Lundh
fredrik at pythonware.com
Wed Nov 24 06:50:45 EST 1999
Philip Tellis <tellis at giasbma.vsnl.net.in> wrote:
> Where are the man pages for python? I am new to python, and would like to
> look through the man pages before I start. Someone please help.
$ man python
NAME
python - an interpreted, interactive, object-oriented pro-
gramming language
SYNOPSIS
python [ -d ] [ -i ] [ -O ] [ -S ] [ -t ] [ -u ] [ -v ] [
-x ] [ -X ]
[ -c command | script | - ] [ arguments ]
DESCRIPTION
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.
Python's basic power can be extended with your own modules
written in C or C++. On most systems such modules may be
dynamically loaded. Python is also adaptable as an exten-
sion language for existing applications. See the internal
documentation for hints.
COMMAND LINE OPTIONS
-d Turn on parser debugging output (for wizards only,
depending on compilation options).
-i When a script is passed as first argument or the -c
option is used, enter interactive mode after exe-
cuting 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.
-O Turn on basic optimizations. This changes the
filename extension for compiled (bytecode) files
from .pyc to pyo.
-S Disable the import of the module site and the site-
dependent manipulations of sys.path that it
entails.
-t 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.
-u Force stdin, stdout and stderr to be totally
unbuffered.
-v Print a message each time a module is initialized,
showing the place (filename or built-in module)
-x 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!
-X Make the standard exceptions strings instead of
classes. Use for backward compatibility with old
code only.
-c command
Specify the command to execute (see next section).
This terminates the option list (following options
are passed as arguments to the command).
INTERPRETER INTERFACE
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] con-
tains the string '-c'. Note that options interpreted by
the Python interpreter itself are not placed in sys.argv.
In interactive mode, the primary prompt is `>>>'; the sec-
ond prompt (which appears when a command is not complete)
is `...'. The prompts can be changed by assignment to
sys.ps1 or sys.ps2. The interpreter quits when it reads
an EOF at a prompt. When an unhandled exception occurs, a
stack trace is printed and control returns to the primary
prompt; in non-interactive mode, the interpreter exits
after printing the stack trace. The interrupt signal
raises the KeyboardInterrupt exception; other UNIX signals
are not caught (except that SIGPIPE is sometimes ignored,
in favor of the IOError exception). Error messages are
written to stderr.
FILES AND DIRECTORIES
These are subject to difference depending on local instal-
lation conventions:
/usr/local/bin/python
Recommended location of the interpreter.
/usr/local/lib/python<version>
Recommended location of the directory containing
the standard modules.
ENVIRONMENT VARIABLES
PYTHONHOME
Change the location of the standard Python
libraries. By default, the libraries are searched
in <prefix>/lib/python<version> and <exec_pre-
fix>/lib/python<version>, where <prefix> and
<exec_prefix> are installation-dependent directo-
ries, both defaulting to /usr/local. When $PYTHON-
HOME is set to a single directory, its value
replaces both <prefix> and <exec_prefix>. To spec-
ify different values for these, set $PYTHONHOME to
<prefix>:<exec_prefix>.
PYTHONPATH
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 <prefix>/lib/python<version>
(see PYTHONHOME below). The default search path is
always appended to $PYTHONPATH. If a script argu-
ment is given, the directory containing the script
is inserted in the path in front of $PYTHONPATH.
The search path can be manipulated from within a
Python program as the variable sys.path .
PYTHONSTARTUP
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 interac-
tive 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.
PYTHONDEBUG
If this is set to a non-empty string it is equiva-
lent to specifying the -d option.
PYTHONINSPECT
If this is set to a non-empty string it is equiva-
lent to specifying the -i option.
PYTHONUNBUFFERED
If this is set to a non-empty string it is equiva-
lent to specifying the -u option.
PYTHONVERBOSE
If this is set to a non-empty string it is equiva-
lent to specifying the -v option.
SEE ALSO
Python Tutorial
Python Library Reference
Python Reference Manual
AUTHOR
Guido van Rossum
CNRI
1895 Preston White Drive
Reston, VA 20191
USA
E-mail: guido at cnri.reston.va.us, guido at python.org
And a cast of thousands.
INTERNET RESOURCES
Web site: http://www.python.org
FTP site: ftp://ftp.python.org
Newsgroup: comp.lang.python
COPYRIGHT
Copyright 1991-1995 by Stichting Mathematisch Centrum,
Amsterdam, The Netherlands.
All Rights Reserved
Permission to use, copy, modify, and distribute this soft-
ware 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
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tisch Centrum or CWI or Corporation for National Research
Initiatives or CNRI not be used in advertising or public-
ity pertaining to distribution of the software without
specific, written prior permission.
While CWI is the initial source for this software, a modi-
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address ftp://ftp.python.org.
STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WAR-
RANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
EVENT SHALL STICHTING MATHEMATISCH CENTRUM OR CNRI BE
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