This document discusses Python data types. It begins by explaining that data types determine the type of value stored in a variable, the operations that can be performed on the data, and provides an example. It then outlines some key properties of Python data types - that Python is dynamically typed, type can change during execution, data types are classes and variables are instances, and Python is strongly but not weakly typed. The document proceeds to explain how to get the data type using type() and categorizes main Python data types into scalars, sequences, mappings and sets.

1. Data Types
by
Jyostna Devi Bodapati

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

3. Python Programming Specialization
Python Programming – Data Structures
Data Type

4. Python Programming Specialization
Python Programming – Data Structures
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

5. Python Programming Specialization
Python Programming – Data Structures
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

6. Python Programming Specialization
Python Programming – Data Structures
Properties of Python Data Types

7. Python Programming Specialization
Python Programming – Data Structures
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

8. Python Programming Specialization
Python Programming – Data Structures
Python Data Types: Property2
▪ 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

9. Python Programming Specialization
Python Programming – Data Structures
Python Data Types: Property3
▪ 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

10. Python Programming Specialization
Python Programming – Data Structures
Python Data Types: Property4
▪ 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

11. Python Programming Specialization
Python Programming – Data Structures
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

12. Python Programming Specialization
Python Programming – Data Structures
Getting the data type

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

14. Python Programming Specialization
Python Programming – Data Structures
Python Data Types

15. Python Programming Specialization
Python Programming – Data Structures
Python Data Types
▪ Python supports numerous data types to support storing variety of data
Data Types
Scalar Sequence Mapping Set

16. Python Programming Specialization
Python Programming – Data Structures
Python Data Types
Data Types
Scalar Data
int
float
complex
boolean
Sequence Data
List
Tuple
String
Mapping Type
Dictionary
Set Type
Set
Frozen Set