2. Boolean Category : 
	1. This category contain only two values True and False
	2. The datatype assigned to these values is
	
	--bool
	b1 = True
	b2 = False

	print(b1)
	print(b2)

	type(b1)
	#bool

	type(b2)
	#bool

	conversion in to bool 
	The conversion of any data will be done by using bool()

	x1 = 12
	bool(x1)
	#True

	x2 = 0
	bool(x2)
	#False

	bool(99)
	#True

	bool(-99)
	#True

	Note : Any datavalue other than 0 is termed as True whereas 0 is termed as 
	False



3. None Category
	--NoneType 

	None Category: 
		1. It allows a single value i.e., None
		2. None means nothing

		n1 = None
		print(n1)               

		type(n1)
		#NoneType

4. Sequential Category : 
	1. The category of datatypes that makes a variable to hold a collection of values
	2. Each value gets  index  by sharing the name of the variable
	3. Python supports two kinds of index
		-- Positive Indexing: 0 to totalLengthOfSequence - 1
		-- Negative Indexing: -totalLengthOfSequence  to - 1   

-- str : 
	1.  A str datatype is a collection of characters enclosed in ' ', " " ,''' ''' ,""" """

	2. str is  immutable or not updatable i.e., once str object is created it can't be changed or increased in size or even decreased in size

	s1 = 'Python'

	#Accessing String characters
	#syntax: sequencename[indexno]

	s1[2]
	#'t'

	s1[-1]
	#'n'

	#Access the first element

	s1[0]
	#'P'

	#Access the last element
	s1[-1]

	print(s1)
	s1[0] = 'p'
	#TypeError: 'str' object does not support item assignment

	#Accessing  multiple elements 
	#syntax: sequencename[starttindex : endindex(exclusive) : step]
	s2 = 'Python Programming'

	sequencename[startindex : endindex(exclusive) : step]

	s2[3:8:2]
	#'hnP'

	s2[3:11:2]
	#'hnPo'

	s2[3:11:3]
	#'h o'

-- list
-- tuple
-- range