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Python tutorial - #5 (Operators in Python)

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Membership Operators

This operator helps us to check an element is found in a sequence or not. It gives there result in Boolean value (True or False).
➥There are two types of Membership operator :-
a) in
b) not in

➢in membership operator

This membership operator returns True if an element is found in a sequence and it returns  False When an element is not found in a sequence.
Program - #1

➢not in membership operator

This membership operator returns True if an element is not found in a sequence and it returns False if an element is found in a sequence.
Program = #2

Identity Operators

This operator helps us to check whether two element are same or not. Actually, this operator compares the memory location of two object, if the memory locations are same then objects are also same otherwise the objects are not same.
                                            Memory location of an object is an integer number value which tells us where the object present in memory .
       To check the memory locations of any object we use id() function which gives an integer value.

This operator also return Boolean value (True or False) as result.
➥There are two types of Identity operator :-
a) is 
b) is not

➢is Operator

This identity operator returns True if one object memory location is same to other object memory location.While it returns False if an object memory location is not same to other object memory location. 
Program = #3

➢is not Operator

This identity operator returns True if an object memory location is not same to other object memory location. While it returns False if one object memory location is same to other object memory location.
Program = #4

Mathematical Functions

Operators are useful, when we deals with basic operation like Addition, Subtraction,Multiplication etc. But when we need to perform various advance operations like to calculate factorial, square root etc. We need a separate tool to perform this, and this tool is called math module.

 Module = Module is a separate file that contains various functions,class etc. which helps us to perform a specific task.
Python contains a large amount of Module that make them so powerful.
              Math is a module that contains several functions to perform mathematical operations. If we want to use any module in our program. First, we need to import that module. so, we need to import math module first. 

 ➧We can import math module as:-
import math
➩once this is done then we can use any functions of math module.

 ➧We can also use import statement as:-
import math as m
➩In this case, we are importing math module and named it as m.

 ➧When we need to import a particular function of math module we can import it as:-
from math import factorial
➩Here, only factorial function is imported from math module.

 ➧We can also import two or more functions of math module as:-
from math import sqrt, factorial




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