Basics of python-introduction

Python is designed for easy interaction between a user and the system. It goes with  an inter­ active function  known as  a shell or listener.  The shell provides a prompt (usually something like »>) and waits for you to type in a Python program or expression. Then it will calculate the expression you given, and print  out the number of the result.  So, for example, a communication with the Python shell might  look like this:

>>> 5 + 5

10

>>> x = 6

>>> x

6

>>> x + x

12

>>> y = 'hi'

>>> y + y

'hihi'

>>>

So, you can use Python as a fancy calculator. And as you describe  your  own functions in Python, you may use the shell to check them  or use them  to compute useful  results.