2. String Literal or Constant  : 1. A string literal in python is a collection of one or more characters enclosed in
     
	'  '    --> Single Quotes
	"  "    --> Double Quotes
	''' ''' --> Triple Single Quotes    
	""" """ --> Triple Double Quotes

	'  '  --> Single Quotes : 1. We can have a string represented in a Single line without apostrophe
										
	'P'
	'python'
	'Python's library is big' 

		'Python's library is big'
				^
		SyntaxError: invalid syntax


	"  " --> Double Quotes : 1. We can have a string represented in a Single line with apostrophe, but not   " 

	"Python's library is big"

	#"Python's library is big"

	"Python's 
	 library 
	 is 
	 big"
 
	#SyntaxError: EOL while scanning string literal

	"Python's library is "big" and even more advantageous"
 
	"Python's library is "big" and even more advantageous"
                            ^
	SyntaxError: invalid syntax
	

	''' ''' --> Triple Single Quotes   : 1. We can have a string represented in multiple lines
                                                          2. Mostly used in documentation in the Python program 
	'''Python's library is "big" and even more advantageous'''
	#'Python\'s library is "big" and even more advantageous'

	'''Python's 
	   library is 
	   "big" and 
	   even more 
	   advantageous'''

	'Python\'s \n   library is \n   "big" and \n   even more \n   advantageous'



	""" """ --> Triple Double Quotes : 1. We can have a string represented in multiple lines similar to Triple Single Quotes

	"""Python's library is "big" and even more advantageous"""
	#'Python\'s library is "big" and even more advantageous'

	"""Python's 
	   library is 
	   "big" and 
	   even more 
	   advantageous"""
   
3. Boolean Literal or Constant : True and False
	True
	False

	print(True)
	print(False)

4. None Literal :1. A None in  python is nithing 

	None
	print(None)

Variables in Python : 
	1. The components of the program that hold the data
	2. They are the memory locations inside the RAM, that contain name,value address and even id
	3. Initialilizing a variable
		  = operator will assign the values int the variable
    4. A variable value can be changed through out program      

	   var1 = 101  --> name: var1   value=101  = --> assignment operator
	   var2 = 56.23
	   var3 =  9-6j
	   var4 = "Venu"
	   var5 = True
	   var6 = None

	   var1=256 --> var1 is changed from 101 to 256
	   
	5. The name of the variables are said to be identifiers. An identifier is a piece of code that identify a component of the program uniquely
	6. In order to declare the identifiers we need to maintain some coding standards
	   1. The identifiers should not start with a digit but a digit can be in any place other than first
		  var1   is fine but 1var is not allowed       
	   2. The identifiers should not contain any spaces
		  myvar=56    is fine but    my var=56
	   3. Only _(underscore) is allowed as a special character
		  my_var is fine but not  my#var
	   4. It is not recommended to use the already developed component names such as keywords, functions etc for the                                                identifiers since there is a danger of overriding the components functionality