Python Sequence Data types in Brief

Sequence Data Types
by
Jyostna Devi Bodapati

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

Sequence Types

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

Sequence Data Type: str

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 str class

Creation of Strings
>>>S1 = ‘Python’
>>>S2 = “Python”
>>>S3 = ‘’’Python’’’
>>>S4 = ‘’’Python
Programming
Specialization’’’

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 ]

String Indexing
• Indexing must be an integer
• Both negative and positive indexing are valid
• Ex: S1 = “HELLO WORLD”

String Indexing
• Integer indexing can be used to access string elements
• Both negative and positive indexing are valid

>>> S1 [ 0 ]
>>> S1 [ 4 ]
>>> S1 [ -2 ]
>>> S1 [ 2: 7 ]

>>> S1 [ 0 ]
>>> S1 [ 4 ]
>>> S1 [ -2 ]
>>> S1 [ 2 : 7 ]
>>> S1 [ 2 : 10 : 2 ]
#returns H
#returns O
#returns L
#returns LLO W
#returns LOWR

Sequence Data Type: list

Sequence Types: list
• Ordered collections of objects of same or different types
• Lists are Mutable
• Examples:
• >>>L3 = [10, 20, 30, 40]
• >>> L4 = [‘Ram', 786 , 2.23, ‘Raj', 70.2]

Sequence Types: list
• L1 = [10, 20, 30, 40, 50, 60, 70]
• Access the entire list → use is its name.
• >>> Print ( L1 )
• Access a single item → use index operator [ ]
• >>> L1 [ 0 ]
• Access part of a list → use slicing operator [ : : ]
• >>> L1 [ 4 : 8 : 2 ]

Sequence Data Type: tuple

Sequence Types: tuple
• Ordered collections of objects of same or different types
• Tuples are Immutable
• Examples:
• >>> T1 = ( 9, 2, 13, 24 )
• >>> T2 = ( ‘Ram', 786 , 2.23, ‘Raj', 70.2 )

Access tuple Elements
• T1 = ( 10, 20, 30, 40, 50, 60, 70 )
• Access the entire tuple → use is its name.
• >>> Print ( T1 )
• Access a single item → use index operator [ ]
• >>> T1 [ 0 ]
• Access part of a tuple → use slicing operator [ : : ]
• >>> T1 [ 2 : 6 : 2 ]

Python Sequence Data types in Brief

Python Sequence Data types in Brief

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