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Data Types
by
Jyostna Devi Bodapati

Python Programming Specialization
Python Programming – Data Structures
Agenda
▪ Properties of Python Data Types
▪ Python Data Types
▪ Scalar
▪ Sequence
▪ Mapping
▪ Set

Data Type

Data Type
▪ Data type determines:
▪ the type of value stored in a variable/object
▪ the operations that can be performed on the data
▪ Ex: s = “Python”
▪ The above statement indicates that s is a string, and it is not valid to perform
operations like arithmetic and bit-wise operations on the variable s

Data Type
▪ Data type determines:
▪ the type of value stored in a variable/object
▪ the operations that can be performed on the data
▪ Ex: a = 100
▪ The above statement indicates that a is an integer , and it is valid to perform
operations like arithmetic, relational and bit-wise operations on the variable a

Properties of Python Data Types

Python Data Types: Property1
▪ Python is a dynamically typed language
▪ Advance Declaration of variables is not required in Python
▪ Depending on the value assigned to the variables, their type is decided
▪ Examples:
▪ >>> a = 10 # int
▪ >>> b = 10.3 # float
▪ >>> c = “Python” # string
▪ >>> d = [10, 20, 30, 40] # list

▪ Type of the variable can be changed during the execution
▪ Examples:
▪ >>> x = 5 # int
▪ >>> x = 0.3 # float
▪ >>> x = “Hello python” # string
▪ >>> x = ( 1, 2, 3, 4 ) # tuple
▪ Note: A variable can not belong to multiple data types at a time

▪ Every data item is treated as an object in Python
▪ Data types are treated as classes
▪ Variables are the instances (objects) of the classes
▪ Example:
▪ >>> A = 100
100A
object
Variable
Instance of
Integer class

▪ In a weakly typed language a compiler / interpreter will sometimes change the
type of a variable
▪ Ex: “Hello” + 5 is valid in weakly typed languages
▪ Such Conversions are not valid in Python
▪ Python is a strongly typed language
▪ Unexpected changes to value/variable type is not valid in Python
▪ Ex: “Hello” + 5 #invalid

Python Data Types: Properties
▪ Python is a dynamically typed language
▪ Data type of a Variable can be changed during execution
▪ Python Data types are classes
▪ Python is a strongly typed language

Getting the data type

Python Data Types: type()
▪ Method type() returns the type of an object
▪ Example:
▪ >>> A = 100
▪ >>> print( type ( A ) )
▪ Output: <class 'int'>

Python Data Types

Python Data Types
▪ Python supports numerous data types to support storing variety of data
Data Types
Scalar Sequence Mapping Set

Python Data Types
Data Types
Scalar Data
int
float
complex
boolean
Sequence Data
List
Tuple
String
Mapping Type
Dictionary
Set Type
Set
Frozen Set

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