man python Command

Man page for apt-get python Command

Man Page for python in Linux

Ubuntu Man Command : man python

Man Python  Command

This tutorial shows the man page for man python in linux.

Open terminal with 'su' access and type the command as shown below:
man python

Result of the Command Execution shown below:

PYTHON(1)                                                                                                                                                  PYTHON(1)



NAME
python an interpreted, interactive, object oriented programming language

SYNOPSIS
python [ B ] [ d ] [ E ] [ h ] [ i ] [ m module name ]
[ O ] [ O0 ] [ R ] [ Q argument ] [ s ] [ S ] [ t ] [ u ]
[ v ] [ V ] [ W argument ] [ x ] [ 3 ] [ ? ]
[ 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. (These documents may be
located via the INTERNET RESOURCES below; they may be installed on your system as well.)

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 extension language for existing applications. See the internal documentation for hints.

Documentation for installed Python modules and packages can be viewed by running the pydoc program.

COMMAND LINE OPTIONS
B Don't write .py[co] files on import. See also PYTHONDONTWRITEBYTECODE.

c command
Specify the command to execute (see next section). This terminates the option list (following options are passed as arguments to the command).

d Turn on parser debugging output (for wizards only, depending on compilation options).

E Ignore environment variables like PYTHONPATH and PYTHONHOME that modify the behavior of the interpreter.

h , ? , help
Prints the usage for the interpreter executable and exits.

i 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.

m module name
Searches sys.path for the named module and runs the corresponding .py file as a script.

O Turn on basic optimizations. This changes the filename extension for compiled (bytecode) files from .pyc to .pyo. Given twice, causes docstrings to
be discarded.

O0 Discard docstrings in addition to the O optimizations.

R Turn on "hash randomization", so that the hash() values of str, bytes and datetime objects are "salted" with an unpredictable pseudo random value.
Although they remain constant within an individual Python process, they are not predictable between repeated invocations of Python.

This is intended to provide protection against a denial of service caused by carefully chosen inputs that exploit the worst case performance of a dict
insertion, O(n^2) complexity. See http://www.ocert.org/advisories/ocert 2011 003.html for details.

Q argument
Division control; see PEP 238. The argument must be one of "old" (the default, int/int and long/long return an int or long), "new" (new division
semantics, i.e. int/int and long/long returns a float), "warn" (old division semantics with a warning for int/int and long/long), or "warnall" (old
division semantics with a warning for all use of the division operator). For a use of "warnall", see the Tools/scripts/fixdiv.py script.

s Don't add user site directory to sys.path.

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. On systems where it matters, also put stdin, stdout and stderr in binary mode. Note that
there is internal buffering in xreadlines(), readlines() and file object iterators ("for line in sys.stdin") which is not influenced by this option.
To work around this, you will want to use "sys.stdin.readline()" inside a "while 1:" loop.

v Print a message each time a module is initialized, showing the place (filename or built in module) from which it is loaded. When given twice, print a
message for each file that is checked for when searching for a module. Also provides information on module cleanup at exit.

V , version
Prints the Python version number of the executable and exits.

W argument
Warning control. Python sometimes prints warning message to sys.stderr. A typical warning message has the following form: file:line: category: mes Äê
sage. By default, each warning is printed once for each source line where it occurs. This option controls how often warnings are printed. Multiple
W options may be given; when a warning matches more than one option, the action for the last matching option is performed. Invalid W options are
ignored (a warning message is printed about invalid options when the first warning is issued). Warnings can also be controlled from within a Python
program using the warnings module.

The simplest form of argument is one of the following action strings (or a unique abbreviation): ignore to ignore all warnings; default to explicitly
request the default behavior (printing each warning once per source line); all to print a warning each time it occurs (this may generate many messages
if a warning is triggered repeatedly for the same source line, such as inside a loop); module to print each warning only the first time it occurs in
each module; once to print each warning only the first time it occurs in the program; or error to raise an exception instead of printing a warning
message.

The full form of argument is action:message:category:module:line. Here, action is as explained above but only applies to messages that match the
remaining fields. Empty fields match all values; trailing empty fields may be omitted. The message field matches the start of the warning message
printed; this match is case insensitive. The category field matches the warning category. This must be a class name; the match test whether the
actual warning category of the message is a subclass of the specified warning category. The full class name must be given. The module field matches
the (fully qualified) module name; this match is case sensitive. The line field matches the line number, where zero matches all line numbers and is
thus equivalent to an omitted line number.

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!

3 Warn about Python 3.x incompatibilities that 2to3 cannot trivially fix.

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 white Äê
space is significant in Python statements! In non interactive mode, the entire input is parsed before 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[0] is an empty string; 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.

In interactive mode, the primary prompt is `>>>'; the second 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 installation conventions; ${prefix} and ${exec_prefix} are installation dependent and should be inter Äê
preted as for GNU software; they may be the same. On Debian GNU/{Hurd,Linux} the default for both is /usr.

${exec_prefix}/bin/python
Recommended location of the interpreter.

${prefix}/lib/python<version>
${exec_prefix}/lib/python<version>
Recommended locations of the directories containing the standard modules.

${prefix}/include/python<version>
${exec_prefix}/include/python<version>
Recommended locations of the directories containing the include files needed for developing Python extensions and embedding the interpreter.

~/.pythonrc.py
User specific initialization file loaded by the user module; not used by default or by most applications.

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 Äê
fix}/lib/python<version>, where ${prefix} and ${exec_prefix} are installation dependent directories, both defaulting to /usr/local. When $PYTHONHOME
is set to a single directory, its value replaces both ${prefix} and ${exec_prefix}. To specify different values for these, set $PYTHONHOME to ${pre Äê
fix}:${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 existent directories are silently ignored. The default search path is installation dependent, but generally begins with ${prefix}/lib/python<ver Äê
sion> (see PYTHONHOME above). The default search path is always appended to $PYTHONPATH. If a script argument 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 interactive commands are executed so that objects defined or imported in it can be used without qualifi Äê
cation in the interactive session. You can also change the prompts sys.ps1 and sys.ps2 in this file.

PYTHONY2K
Set this to a non empty string to cause the time module to require dates specified as strings to include 4 digit years, otherwise 2 digit years are
converted based on rules described in the time module documentation.

PYTHONOPTIMIZE
If this is set to a non empty string it is equivalent to specifying the O option. If set to an integer, it is equivalent to specifying O multiple
times.

PYTHONDEBUG
If this is set to a non empty string it is equivalent to specifying the d option. If set to an integer, it is equivalent to specifying d multiple
times.

PYTHONDONTWRITEBYTECODE
If this is set to a non empty string it is equivalent to specifying the B option (don't try to write .py[co] files).

PYTHONINSPECT
If this is set to a non empty string it is equivalent to specifying the i option.

PYTHONNOUSERSITE
If this is set to a non empty string it is equivalent to specifying the s option (Don't add the user site directory to sys.path).

PYTHONUNBUFFERED
If this is set to a non empty string it is equivalent to specifying the u option.

PYTHONVERBOSE
If this is set to a non empty string it is equivalent to specifying the v option. If set to an integer, it is equivalent to specifying v multiple
times.

PYTHONHASHSEED
If this variable is set to "random", the effect is the same as specifying the R option: a random value is used to seed the hashes of str, bytes and
datetime objects.

If PYTHONHASHSEED is set to an integer value, it is used as a fixed seed for generating the hash() of the types covered by the hash randomization.
Its purpose is to allow repeatable hashing, such as for selftests for the interpreter itself, or to allow a cluster of python processes to share hash
values.

The integer must be a decimal number in the range [0,4294967295]. Specifying the value 0 will lead to the same hash values as when hash randomization
is disabled.

AUTHOR
The Python Software Foundation: http://www.python.org/psf

INTERNET RESOURCES
Main website: http://www.python.org/
Documentation: http://docs.python.org/
Developer resources: http://www.python.org/dev/
Downloads: http://python.org/download/
Module repository: http://pypi.python.org/
Newsgroups: comp.lang.python, comp.lang.python.announce

LICENSING
Python is distributed under an Open Source license. See the file "LICENSE" in the Python source distribution for information on terms & conditions for
accessing and otherwise using Python and for a DISCLAIMER OF ALL WARRANTIES.



$Date: 2010 01 31 11:09:16 0500 (Sun, 31 Jan 2010) $ PYTHON(1)-


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