Python Environment Building 2

python can be applied to multiple platforms including Linux and Mac OS x. The general Linux distribution comes with Python,mac OS X The latest version also comes with Python, which is already installed and does not need to be reconfigured.

Download the latest version of the Python 2.7.9 directly under Windows, and when you install it, pay attention to choosing

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

• Unix (Solaris, Linux, FreeBSD, AIX, Hp/ux, SunOS, IRIX, etc.). )

• Win 9x/nt/2000

• Macintosh (Intel, PPC, 68K)

• Os/2

• DOS (multiple DOS versions)

• PalmOS

• Nokia Mobile Phone

• Windows CE

• Acorn/risc OS

• BeOS

• Amiga

• Vms/openvms

• Qnx

• VxWorks

• Psion

• Python can also be ported to Java and. NET virtual machines.

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 used 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://www.cwi.nl/~jack/macpython.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.

Python Environment variables

Here are a few important environment variables that apply to Python:

Variable name	Description
PYTHONPATH	Pythonpath is the Python search path, and by default our import module will be searched from the Pythonpath.
Pythonstartup	After Python starts, look for the PYTHONSTARTUP environment variable and execute the execution code specified by the variable in this file.
Pythoncaseok	Adding Pythoncaseok environment variables makes python case-insensitive when importing modules.
Pythonhome	Another module search path. It is typically embedded in the Pythonstartup or Pythonpath directory, making it easier to switch between two module libraries.

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

C:>python # Windows/dos

The following are the Python command-line parameters:

Options	Description
-D	Display debug information at parse time
-O	Generate optimization code (. pyo file)
-S	Do not introduce a location to find Python paths at startup
-V	Output Python version number
-X	The built-in exception (for strings only) since the 1.6 release is obsolete.
-C cmd	Executes the Python script and runs the result as a CMD string.
File	Executes a Python script in the 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

./script.py # Unix/linux

Or

C:>python script.py # Windows/dos

Note: when executing a script, check to see if the script has executable permissions.

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.

Make sure your environment has been successfully built. If you are not able to build the right environment, then you can get help from your system administrator.

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Python Environment Building 2