Python Environment configuration

Python Environment Setup

In this section we will show you how to build a python development environment locally.

Python can be applied to multiple platforms including Linux and Mac OS x.

You can enter the "python" command from the terminal window to see if you have installed Python and the Python installation version locally.

Python download

Python's latest source code, binary documents, news, etc. can be found on the Python website:

Python official website: http://www.python.org/

You can download the Python document in the link, and you can download the documents in HTML, PDF and PostScript format.

Python Document: www.python.org/doc/

Python installation

Python has been ported on many platforms (modified to make it work on different platforms).

You will need to download the binary code that is appropriate for your use of the platform, and then install Python.

If the binary code of your platform is not available, you need to compile the source code manually using the C compiler.

The compiled source code, with more selectivity in functionality, provides more flexibility for Python installation.

Here's how to install Python on different platforms:

Unix & Linux Platform Installation Python:

Here are the simple steps to install Python on UNIX & Linux platforms:

• Open a Web browser to access http://www.python.org/download/

• Select the source compression package for unix/linux.

• Download and unzip the zip package.

• If you need to customize some options to modify modules/setup

• execute the./configure Script

• Make

• Make install

After doing this, Python is installed in the/usr/local/bin directory, and the Python library is installed in/USR/LOCAL/LIB/PYTHONXX,XX for the version number of the python you are using.

Windows platform installs Python:

Here are the simple steps to install Python on the Window platform:

• Open a Web browser to access http://www.python.org/download/

• Select the Window platform installation package in the download list, in the package format:python-xyz.msi file, XYZ is the version number you want to install.

• To use setup python-xyz.msi, Windows systems must be supported with Microsoft Installer 2.0. Just save the installation file to your local computer, and then run it to see if your machine supports MSI. Windows XP and later versions already have MSI, and many older machines can also install MSI.

• After downloading, double-click the download package, go to the Python Installation Wizard, the installation is very simple, you just need to use the default settings always click "Next" until the installation is complete.

MAC Platform Installation Python:

The most recent Macs system comes with a python environment, but the Python version comes with an older version, and you can view the new features of Python on your Mac via the link http://www.python.org/download/mac/.

Complete Python installation tutorials on Mac You can view:http://homepages.cwi.nl/~jack/macpython/index.html

Environment variable Configuration

Programs and executables can be in many directories, and these paths are probably not in the search path where the operating system provides executable files.

The path is stored in an environment variable, which is a named string maintained by the operating system. These variables contain information about the available command-line interpreters and other programs.

Path variable in UNIX or Windows is path (Unix case-sensitive, Windows is case-insensitive).

In Mac OS, the setup process changes the Python installation path. If you need to reference Python in another directory, you must add a Python directory to the path.

Setting environment variables in Unix/linux

• in CSH Shell: input
  

  Setenv PATH "$PATH:/usr/local/bin/python"

  , press "Enter".

• in Bash Shell (Linux): input
  

  Export path= "$PATH:/usr/local/bin/python"

  , press "Enter".

• in sh or ksh shell: input
  

  Path= "$PATH:/usr/local/bin/python"

  , press "Enter".

Note: /usr/local/bin/python is the installation directory for Python.

Setting environment variables in Windows

To add a Python directory to an environment variable:

• in the Command Prompt box (cmd): Enter
  

  path=%path%; C:\Python

  , press "Enter".

Note: C:\Python is the installation directory for Python.

Run Python

There are three ways to run Python:

1. Interactive interpreter:

You can enter Python from a command-line window and start writing Python code in the interactive interpreter.

You can do python coding in unix,dos or any other system that provides a command line or shell.

$python # Unix/linux

Or

python% # Unix/linux

Or

C:>python # Windows/dos

The following is a python command parameter

-D	Display debug information at parse time
-O	Generate an optimization code (. pyo file)
-S	Where to find Python paths at startup
-V	View version
-C cmd	Executes a Python script and runs the result as a CMD output string
File	Executes a python script in a given Python file

2. Command line script

In your application, you can execute a python script on the command line by introducing an interpreter, as follows:

$python script.py # unix/linux or python% script.py # unix/linux or C:>python script.py # Windows/dos

3. Integrated development Environment (ide:integrated development environment)

You can use a graphical user interface (GUI) environment to write and run Python code. The following are recommended for use by the IDE on each platform:

• Unix: IDLE is the earliest Python IDE on UNIX.

• Windows: Pythonwin is a Python integrated development environment that is superior to the IDE in many ways

• Macintosh: Python's Mac can use the idle IDE, and you can download the corresponding Mac's idle on your website.

• pycharm: pycharm is a Python IDE with a complete set of tools to help users improve their efficiency when developing with the Python language, such as debugging, syntax highlighting, project management, code jumps, smart tips, AutoComplete, unit tests, versioning. In addition, the IDE provides advanced features to support professional web development under the Django framework.

more please see Python Environment Setup

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Python Environment configuration