How To Set Python Path Linux

Python - Environment Setup

Python is available on a broad variety of platforms including Linux and Mac OS X. Permit's understand how to ready our Python environment.

Local Environs Setup

Open a terminal window and blazon "python" to find out if information technology is already installed and which version is installed.

Unix (Solaris, Linux, FreeBSD, AIX, HP/UX, SunOS, IRIX, etc.)
Win 9x/NT/2000
Macintosh (Intel, PPC, 68K)
Os/ii
DOS (multiple versions)
PalmOS
Nokia mobile phones
Windows CE
Acorn/RISC Bone
BeOS
Amiga
VMS/OpenVMS
QNX
VxWorks
Psion
Python has as well been ported to the Java and .Cyberspace virtual machines

Getting Python

The nigh up-to-date and current source code, binaries, documentation, news, etc., is available on the official website of Python https://world wide web.python.org/

Yous tin download Python documentation from https://www.python.org/doc/. The documentation is available in HTML, PDF, and PostScript formats.

Installing Python

Python distribution is available for a wide variety of platforms. Y'all need to download merely the binary code applicable for your platform and install Python.

If the binary code for your platform is not available, you need a C compiler to compile the source code manually. Compiling the source code offers more flexibility in terms of choice of features that you require in your installation.

Here is a quick overview of installing Python on various platforms −

Unix and Linux Installation

Hither are the elementary steps to install Python on Unix/Linux car.

Open a Web browser and go to https://world wide web.python.org/downloads/.
Follow the link to download zipped source lawmaking available for Unix/Linux.
Download and extract files.
Editing the Modules/Setup file if you desire to customize some options.
run ./configure script
make
make install

This installs Python at standard location /usr/local/bin and its libraries at /usr/local/lib/pythonXX where XX is the version of Python.

Windows Installation

Here are the steps to install Python on Windows machine.

Open a Web browser and become to https://www.python.org/downloads/.
Follow the link for the Windows installer python-XYZ.msi file where XYZ is the version you need to install.
To use this installer python-XYZ.msi, the Windows organization must support Microsoft Installer 2.0. Save the installer file to your local machine and then run it to find out if your auto supports MSI.
Run the downloaded file. This brings upwards the Python install wizard, which is actually piece of cake to apply. Just accept the default settings, wait until the install is finished, and you are done.

Macintosh Installation

Recent Macs come with Python installed, just information technology may be several years out of date. See http://www.python.org/download/mac/ for instructions on getting the current version along with extra tools to support evolution on the Mac. For older Mac Bone'south before Mac OS X 10.3 (released in 2003), MacPython is bachelor.

Jack Jansen maintains information technology and you tin can have full access to the entire documentation at his website − http://www.cwi.nl/~jack/macpython.html. You lot tin find consummate installation details for Mac OS installation.

Setting up PATH

Programs and other executable files can be in many directories, so operating systems provide a search path that lists the directories that the OS searches for executables.

The path is stored in an surroundings variable, which is a named string maintained by the operating system. This variable contains information available to the command shell and other programs.

The path variable is named equally PATH in Unix or Path in Windows (Unix is case sensitive; Windows is not).

In Mac OS, the installer handles the path details. To invoke the Python interpreter from any particular directory, you must add the Python directory to your path.

Setting path at Unix/Linux

To add the Python directory to the path for a particular session in Unix −

In the csh crush − type setenv PATH "$PATH:/usr/local/bin/python" and printing Enter.
In the bash beat out (Linux) − type export PATH="$PATH:/usr/local/bin/python" and press Enter.
In the sh or ksh beat out − type PATH="$PATH:/usr/local/bin/python" and press Enter.
Note − /usr/local/bin/python is the path of the Python directory

Setting path at Windows

To add the Python directory to the path for a particular session in Windows −

At the command prompt − type path %path%;C:\Python and press Enter.

Note − C:\Python is the path of the Python directory

Python Environment Variables

Here are important environment variables, which tin exist recognized by Python −

Sr.No.	Variable & Description
1	PYTHONPATH It has a part similar to PATH. This variable tells the Python interpreter where to locate the module files imported into a program. It should include the Python source library directory and the directories containing Python source code. PYTHONPATH is sometimes preset by the Python installer.
2	PYTHONSTARTUP Information technology contains the path of an initialization file containing Python source lawmaking. It is executed every time you lot commencement the interpreter. It is named as .pythonrc.py in Unix and information technology contains commands that load utilities or change PYTHONPATH.
3	PYTHONCASEOK Information technology is used in Windows to instruct Python to find the get-go case-insensitive match in an import argument. Set this variable to whatsoever value to activate it.
4	PYTHONHOME It is an alternative module search path. Information technology is ordinarily embedded in the PYTHONSTARTUP or PYTHONPATH directories to make switching module libraries easy.

Running Python

There are iii different means to start Python −

Interactive Interpreter

You can start Python from Unix, DOS, or whatever other system that provides you a command-line interpreter or shell window.

Enter python the command line.

Start coding correct away in the interactive interpreter.

$python # Unix/Linux or python% # Unix/Linux or C:> python # Windows/DOS

Hither is the list of all the bachelor command line options −

Sr.No.	Option & Clarification
1	-d Information technology provides debug output.
ii	-O It generates optimized bytecode (resulting in .pyo files).
3	-Due south Practise non run import site to expect for Python paths on startup.
iv	-5 verbose output (detailed trace on import statements).
5	-Ten disable course-based congenital-in exceptions (just employ strings); obsolete starting with version 1.6.
six	-c cmd run Python script sent in as cmd cord
7	file run Python script from given file

Script from the Command-line

A Python script can be executed at command line by invoking the interpreter on your application, equally in the following −

$python script.py # Unix/Linux  or  python% script.py # Unix/Linux  or   C: >python script.py # Windows/DOS

Note − Be sure the file permission manner allows execution.

Integrated Development Environment

You tin can run Python from a Graphical User Interface (GUI) environment too, if yous accept a GUI application on your system that supports Python.

Unix − IDLE is the very first Unix IDE for Python.
Windows − PythonWin is the first Windows interface for Python and is an IDE with a GUI.
Macintosh − The Macintosh version of Python forth with the IDLE IDE is available from the primary website, downloadable equally either MacBinary or BinHex'd files.

If you are not able to set upwardly the environment properly, then yous can take help from your system admin. Make sure the Python environment is properly ready and working perfectly fine.

Note − All the examples given in subsequent capacity are executed with Python two.4.3 version bachelor on CentOS flavor of Linux.

Nosotros already have set Python Programming environs online, and so that you can execute all the bachelor examples online at the same time when you are learning theory. Feel free to modify any example and execute it online.