Python -A basic view

Python is a high level programming language which is based on object oriented technology. You can interpret it directly. It is an interactive language in web development applications.

Who developed it???

Guido van Rossum was the creator.

Advantages:

It has lots and lots of advantages to programmers.

·      It is a portable language.

·      It can be compatible with many platforms.

·      It has wide range of functions in its library.

·      It is GUI based programming language which is benefit for web programmers and many more…

Let us the journey to python.

How to start the python?????

·      First, download the python software from python website.  Install it to your computer.

 ·      To Set the path in windows command prompt, type the following

Path % Path%; c:\python

Where C:\python is the path of the python folder in the system.

 ·      Now, your system is ready to interpret the python program.

 

First program in python:

·      Open a notepad application, create a new file with the name “first.py”

·      Type the following program

Print(“ welcome to the world of python”) and Save the program.

 

·      Now, Open the command prompt and run the program by “python first.py” 

·      You get the output “ Welcome to the world of python”.

Basics of python programming

The basics of python programming starts with declaring identifiers and datatypes.  The identifier may be a variable, class or a module. To declare an identifier, some rules are there.  They are as follows.

The identifier name should start with any alphabets (AtoZ,atoz) or underscore symbol( _ ) followed by digits(0 to 9).

Eg:  valid: a, count, _sum, name20

 Invalid: b!, c#, v%

  

Datatypes:

Python has standard data types. Standard datatypes are numbers, strings,lists, tuples and directory. The way of declaring python datatypes are given below

  

Number	int long float complex
Strings	Str1=”Welcome”
List	List=[‘name’,21,’it dept’,’abc college’]
Tuple	Tuple=[‘name’, 34,’cse dept’,’cde college’]
Directory	Dict={} Dict[‘first’]=” first name” Dict[id]=”abc1”

 Table 1: Datatypes and sample declaration.

     These are basics of python programming. Next part deals with the operators, expressions and conditional statements.