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Variable

• A variable is a location used to store data in the memory. It is helpful to think of variables as a container that holds data which can be changed later throughout programming. In Python, we don't need to specify the type of variable because Python is a dynamically-typed. It automatically decides the datatype depending on type of value.

Syntax: For Example: A=27
B="CCIT"
C=True

Data Types

• Variables can store data of different types, and different types can do different things.
• . Every value in Python has a datatype. Since everything is an object in Python programming, data types are actually classes and variables are instance (object) of these classes.
• There are various data types in Python. Some of the important types are listed below.

Text Type	String
Numbers	Integer , Float, complex
Sequence Types	List, Tuple ,Sets
Mapping Type	Dictionary
Boolean Type	Bool
Binary Types	Bytes, Bytearray

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Identifier

• Python Identifier is the name we give to identify a variable, function, class, module or other object.
• That means whenever we want to give an entity a name, that’s called identifier.

Rules:

• Identifier must start with a letter or the underscore character.
• Next can be alphabets digits or underscores.
• Variable names are case-sensitive.
• Language keywords are not allowed.
• No max limit.

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Keywords

• Python keywords are the words that are reserved. That means you can’t use them as name of any entities like variables, classes and functions. So you might be thinking what these keywords are for. They are for defining the syntax and structures of Python language.
• You should know there are 33 keywords in Python programming language. Also keywords in Python is case sensitive. So they are to be written as it is. Here is a list of all keywords in python programming.

false	none	in	w hile
assert	def	import	try
as	finally	if	return
and	except	nonlocal	raise
true	else	lambda	yield
del	elif	is	with
pass	break	not	class
grom	for	or	continue

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Numbers

• Data types that store numeric values are called Number. If you change the value of a number data type, this results in a newly allocated object. So you can call numbers immutable. We can simply create a number object by assigning some value to a variable.
• Python supports three different Number data types:
• Int
• Float
• Complex

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Int

• Integer, is a whole number, positive or negative, without decimals, of unlimited length (from python 3.0 ).

For ex:
1234, −24, 0, 99999999999999
0o177, 0x9ff, 0b101010

Prefix	Description	Base	Example
0b or 0B	Binary Number	2	0b0101 , 0b0011
0o or 0O	Octal Number	7	0o134, 0o017
Nothing	Decimal Number	10	12, 34 , -5
0x or 0X	Hexadecimal Number	16	0x9ff , 0x1AC

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Float

• Float, or "floating point number" is a number, positive or negative, containing decimal point.

For ex:
1.23, 1.
3.14e-10, 4E210, 4.0e+210

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Complex

• Complex numbers are written with a "j" as the imaginary part.

For ex:3+4j, 3.0+4.0j, 3J

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String Datatype

• The string is a sequence of characters. Python supports Unicode characters. Generally, strings are represented by either single or double quotes. Python treats single quotes the same as double quotes.

String Quotes	Example
Single quotes	'Welcome to CCIT'
Double quotes	"Welcome to CCIT"
Triple quotes	'''Welcome to CCIT Amravati''' """Welcome to CCIT Amravati"""

• Single and Double quotes:-Single and double quotes are used for single line string
• Triple quotes:Triple quotes are used for multiline string.

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Boolean Datatype

• Booleans represent one of two values: True or False. In programming you often need to know if an expression is True or False. You can evaluate any expression in Python, and get one of two answers, True or False.

Boolean Datatype	True and False

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