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Python - Network Environment
Paresh Mehta
2 years ago
Table of Contents
- Introduction
- Local Environment Setup
- Getting Python
Windows platform
Linux platform
Mac OS
- Setting up PATH
Setting Path at Unix/Linux
Setting Path at Windows
- Running Python
Interactive Interpreter
Integrated Development Environment
Introduction
Python 3 is available for Windows, Mac OS, and most of the flavors of the Linux operating system. Even though Python 2 is available for many other OSs, Python 3 support either has not been made available for them or has been dropped.
Local Environment Setup
Open a terminal window and type "python" to find out if it is already installed and which version is installed.
Getting Python
Windows platform
Binaries of latest version of Python 3 (Python 3.5.1) are available on this download page
The following different installation options are available.
- Windows x86-64 embeddable zip file
- Windows x86-64 executable installer
- Windows x86-64 web-based installer
- Windows x86 embeddable zip file
- Windows x86 executable installer
- Windows x86 web-based installer
Note − In order to install Python 3.5.1, minimum OS requirements are Windows 7 with SP1. For versions 3.0 to 3.4.x Windows XP is acceptable.
Linux platform
Different flavors of Linux use different package managers for installation of new packages.
On Ubuntu Linux, Python 3 is installed using the following command from the terminal.
$sudo apt-get install python3-minimal
Installation from source
Download Gzipped source tarball from Python's download URL − https://www.python.org/ftp/python/3.5.1/Python-3.5.1.tgz
Extract the tarball
tar xvfz Python-3.5.1.tgz
Configure and Install:
cd Python-3.5.1
./configure --prefix = /opt/python3.5.1
make
sudo make install
Mac OS
Download Mac OS installers from this URL − https://www.python.org/downloads/mac-osx/
- Mac OS X 64-bit/32-bit installer − python-3.5.1-macosx10.6.pkg
- Mac OS X 32-bit i386/PPC installer − python-3.5.1-macosx10.5.pkg
- Mac OS X 32-bit i386/PPC installer − python-3.5.1-macosx10.5.pkg
Double click this package file and follow the wizard instructions to install.
The most up-to-date and current source code, binaries, documentation, news, etc., is available on the official website of Python −
Python Official Website − https://www.python.org/
You can download Python documentation from the following site. The documentation is available in HTML, PDF and PostScript formats.
Python Documentation Website − www.python.org/doc/
Setting up PATH
Programs and other executable files can be in many directories. Hence, the operating systems provide a search path that lists the directories that it searches for executables.
The important features are −
- The path is stored in an environment 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 is stored in an environment 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 as PATH in Unix or Path in Windows (Unix is case-sensitive; Windows is not).
The path variable is named as 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.
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 shell − type setenv PATH "$PATH:/usr/local/bin/python3" and press Enter.
In the csh shell − type setenv PATH "$PATH:/usr/local/bin/python3" and press Enter.
- In the bash shell (Linux) − type export PYTHONPATH=/usr/local/bin/python3.4 and press Enter.
In the bash shell (Linux) − type export PYTHONPATH=/usr/local/bin/python3.4 and press Enter.
- In the sh or ksh shell − type PATH="$PATH:/usr/local/bin/python3" and press Enter.
In the sh or ksh shell − type PATH="$PATH:/usr/local/bin/python3" and press Enter.
Note − /usr/local/bin/python3 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.
At the command prompt − type path %path%;C:\Python and press Enter.
Note − C:\Python is the path of the Python directory
Running Python
There are three different ways to start Python −
Interactive Interpreter
You can start Python from Unix, DOS, or any other system that provides you a command-line interpreter or shell window.
Enter python the command line.
Start coding right away in the interactive interpreter.
$python # Unix/Linux
or
python% # Unix/Linux
or
C:>python # Windows/DOS
Integrated Development Environment
You can run Python from a Graphical User Interface (GUI) environment as well, if you have a GUI application on your system that supports Python.
- Unix − IDLE is the very first Unix IDE for 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.
Windows − PythonWin is the first Windows interface for Python and is an IDE with a GUI.
- Macintosh − The Macintosh version of Python along with the IDLE IDE is available from the main website, downloadable as either MacBinary or BinHex'd files.
Macintosh − The Macintosh version of Python along with the IDLE IDE is available from the main website, downloadable as either MacBinary or BinHex'd files.
If you are not able to set up the environment properly, then you can take the help of your system admin. Make sure the Python environment is properly set up and working perfectly fine.
Note − All the examples given in subsequent chapters are executed with Python 3.4.1 version available on Windows 7 and Ubuntu Linux.
We have already set up Python Programming environment online, so that you can execute all the available examples online while you are learning theory. Feel free to modify any example and execute it online.
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