CHAPTER 2: " PYTHON" ( VARIABLES AND DATA TYPES)

 Variables and Datatypes

                                        A variable is the name given to a memory location in a program for example

• a = 34 IN
• b = "He"
• C = 722.56

 

Data Types  

                                 Primarily there are following data types in Python Integers 

1. Integers
2. Floating point numbers. Strings
3.Strings
4.Booleans
5. None

                     Python is a fantastic language that automatically identifies the type of data for us.

a = 71 --( Identifies a as classs<int>)

 

b = 88.44 => Identifies b as class < flat >

name = "He" →Identifies name as class <Str>

Rules for defining a Variable name → Also applies to other  identifiers.

• A variable name can contain alphabet's, digit's and underscores.
• A Variable name can only start with an alphabet and underscore.
• A Variable name cant start with a digit .
•  No while space is allowed to be used inside Variable name.

Examples of a few variable names are  : her, ones, seven, -Seven etc..

Operators in Python

 following are some common operators in Python 

1. Arithmetic operators => +, -,*, / ,etc."

2. Assignment operators ⇒ = , + =, - = ,etc.

3. Comparison operates => ==, >,>=, <, !=, etc.

4. Logical operators  => and, or, not

type () function and Typecasting :

        type function is used to find the data type of a given variable in Python.

• a = 3
• type(a) => class < int>
• b="31" type
• type (b) => class  <str>

A number can be converted into a string and Vice versa (If possible) . There are many functions to convert one data type into another.

• str(31)=>  "31"      Integer to String Conversion 
•  int("32") => 32     string to Integer conversion
•   float (32) = 32.0  Integer to float Conversion

                                      and so on.....

Hear "31 " is a string literal and 31 a numeric literal.
input() function

Mast This function allows the user to take input from the keyboard as a string

a = input (" Enter name")  

It is important to note that  the output of input is always a String ( even if the number entered )

                                          THANK YOU;

FOLLOW ME ON INSTAGRAM: "teacherseye360"