PYTHON

Python

- High level language
- Object-oriented programming language
- Interpreted scripting language - Debugging fast because there is no compilation
- Dynamic


PYTHON VERSIONS

Python 1.0 - features like: lambda, map, filter, and reduce.
Python 2.0 - features like: list comprehensions, garbage collection system.
Python 3.0 (Py3K) 

Latest version of python is 3.7.0

SIMPLE PYTHON PROGRAM

- Save the python files with .py extension 
- Execute the python program using below code

        python filename.py


Hello.py

print("hello")  

Python Variables

- We don't need to specify the type of variable.
- Variable names can be a group of both letters and digits - kt1.
- They have to begin with a letter or an underscore - jk or _h.
- Use lowercase letters for variable name.
- Variable name should not be a keyword.
- We can create variable at required time.

Variable Declarations

a=4

ty='software'

sal=2000.5

q=w=e=50

q,w,e=10,20,50

Identifiers

- Names given to variables ,class ,object ,functions , lists , dictionaries.

- An identifier is a long sequence of characters and numbers.

- No special character except underscore ( _ ) can be used as an identifier.

- Keyword should not be used as an identifier name.

- Python is case sensitive. So using case is significant.

- First character of an identifier can be character, underscore ( _ ) but not digit.

Literals

String :-

1) Single line String 

           a="hai" or a='hai'

2) Multi line String 

           ab='hai\      

                  hello'                                             o/p -  haihello

           ab= '''''welcome                                 o/p - welcome

                       to                                                      to

                       world'''                                             world