How to download and installation Python software in Windows operating system:

Steps involved to download and installation of python

Step 1: Go to website www.python.org and click downloads select version which you want.

Step 2: Click on Python 3.9.1 and download. After download open the file.

Step 3: Click on Next to continue.

Step 4: After installation location will be displayed. The Default location is C:\Python27.

Click on next to continue.

Step 5: After the python interpreter and libraries are displayed for installation. Click on Next to continue.

Installation has been processed.

Step 7: Click the Finish to complete the installation.

Setting up PATH to python:

Ø 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.

Ø 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.

Ø Copy the Python installation location C:\Python27

Ø Right-click the My Computer icon on your desktop and choose Properties. And then select Advanced System properties.

Ø

Path and click on

Edit.

Ø Add semicolon (;) at end and copy the location C:\Python27 and give semicolon (;) and click OK.

Running Python:

a.     Running Python Interpreter:

Ø Python comes with an interactive interpreter. When you type python in your shell or command prompt, the python interpreter becomes active with a >>> prompt and waits for your commands.

Now you can type any valid python expression at the prompt. Python reads the typed expression, evaluates it and prints the result.

b. Running Python Scripts in IDLE:

Ø Goto File menu click on New File (CTRL+N) and write the code and save add.py a=input("Enter a value ")

b=input("Enter b value ") c=a+b

print "The sum is",c

Ø And run the program by pressing F5 or RunRun Module.

c. Running python scripts in Command Prompt:

Ø Before going to run we have to check the PATH in environment variables.

Ø Open your text editor, type the following text and save it as hello.py.