0001 Python Introduction

 1. 

Python is a programming language.

It can be used on a server to create web applications.

2.

print("Hello world")

Output:

Hello World

3.

How to find the python version:

i. from cmd.exe

>python --version

ii. from an editor 

import sys

print(sys.version)

4.

Python can be run as a command line itself.

Type the following on the Windows, Mac or Linux command line:

C:\Users\sathi>python

or

C:\Users\sathi>py

From there you can write any python.

Whenever you are done in the python command line, you can simply type the following to quit the python command line interface:

exit()

5. 

Python syntax can be executed by writing directly in the Command Line.

Or by creating a python file on the server, using the .py file extension, and running it in the Command Line.

6.

Q 1.

What is the difference between global and local scope?

A variable created in the main body of the Python code is a global variable and belongs to the global scope. Global variables are available from within any scope, global and local. 

A variable created inside a function belongs to the local scope of that function, and can only be used inside that function.