Python Sequence Data types in Brief

Introduces Various Python Sequence Data types like strings, Lists and Tuples

1. Sequence Data Types
by
JyostnaDevi Bodapati

2. 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

3. Python Programming Specialization
Python Programming –Data Structures
Sequence Types

4. Python Programming Specialization
Python Programming –Data Structures
Sequence Data Types
Sequence is the ordered collection of elements
Allows to store multiple values in an organized and efficient manner
Sequence
String List Tuple

5. Python Programming Specialization
Python Programming –Data Structures
Sequence Data Type: str

6. Python Programming Specialization
Python Programming –Data Structures
Sequence Types: str
•A string is a collection of one or more characters
•Python strings can be enclosed either in single, double or triple quotes
•Python Strings belongs to strclass

7. Python Programming Specialization
Python Programming –Data Structures
Creation of Strings
>>>S1 = ‘Python’
>>>S2 = “Python”
>>>S3 = ‘’’Python’’’
>>>S4 = ‘’’Python
Programming
Specialization’’’

8. Python Programming Specialization
Python Programming –Data Structures
Accessing String Elements
•Let S1 = “HELLO WORLD”
•How do we access the contents of the string?
•String elements can be accessed by passing an index with the name of the
string
•String name [ index ]

9. Python Programming Specialization
Python Programming –Data Structures
String Indexing
•Indexing must be an integer
•Both negative and positive indexing are valid
•Ex: S1 = “HELLO WORLD”

10. Python Programming Specialization
Python Programming –Data Structures
String Indexing
•Integer indexing can be used to access string elements
•Both negative and positive indexing are valid
•Ex: S1 = “HELLO WORLD”

11. Python Programming Specialization
Python Programming –Data Structures
String Indexing
•Integer indexing can be used to access string elements
•Both negative and positive indexing are valid
•Ex: S1 = “HELLO WORLD”

12. Python Programming Specialization
Python Programming –Data Structures
Accessing String Elements
•Ex: S1 = “HELLO WORLD”
>>> S1 [ 0 ]
>>> S1 [ 4 ]
>>> S1 [ -2 ]
>>> S1 [ 2: 7 ]

13. Python Programming Specialization
Python Programming –Data Structures
Accessing String Elements
•Ex: S1 = “HELLO WORLD”
>>> S1 [ 0 ]
>>> S1 [ 4 ]
>>> S1 [ -2 ]
>>> S1 [ 2 : 7 ]
>>> S1 [ 2 : 10 : 2 ]
#returns H
#returns O
#returns L
#returns LLO W
#returns LOWR

14. Python Programming Specialization
Python Programming –Data Structures
Sequence Data Type: list

15. Python Programming Specialization
Python Programming –Data Structures
Sequence Types: list
•Orderedcollections of objects​ of same or different types
•ListsareMutable​
•Examples:
•>>>L3 = [10, 20, 30, 40]
•>>> L4= [‘Ram', 786 , 2.23, ‘Raj', 70.2]

16. Python Programming Specialization
Python Programming –Data Structures
Sequence Types: list
•L1 = [10, 20, 30, 40, 50, 60, 70]
•Access theentire list→useis its name.​
•>>> Print ( L1 )​
•Access asingle item→use index operator [ ] ​
•>>> L1 [ 0 ] ​
•Accesspart of a list→use slicing operator [ : : ]​
•>>> L1 [ 4 : 8 : 2 ]

17. Python Programming Specialization
Python Programming –Data Structures
Sequence Data Type: tuple

18. Python Programming Specialization
Python Programming –Data Structures
Sequence Types: tuple
•Orderedcollections of objects​ of same or different types
•TuplesareImmutable
•Examples:
•>>> T1 = ( 9, 2, 13, 24 )
•>>> T2 = ( ‘Ram', 786 , 2.23, ‘Raj', 70.2 )

19. Python Programming Specialization
Python Programming –Data Structures
Access tuple Elements
•T1 = ( 10, 20, 30, 40, 50, 60, 70 )
•Access theentire tuple→useis its name.​
•>>> Print ( T1 )​
•Access asingle item→use index operator [ ] ​
•>>> T1 [ 0 ] ​
•Accesspart of a tuple→use slicing operator [ : : ]​
•>>> T1 [ 2 : 6 : 2 ]