Tuples in Python Class 11 Notes | Tuple and Dictionaries

  

Tuple in Python

• Tuple is built in sequence data type in python.
• Stores multiple values
• Tuple item can be of different data types
• All the items are comma separated and enclosed in parenthesis ‘()’.
• Individual item in a Tuple can be accessed using index which begins from 0.
• In case of single item present in tuple, it should also be followed by a comma.
• A sequence without parenthesis is treated as tuple by default.

Examples

Accessing elements in a Tuple

• Individual item in a Tuple can be accessed using indexes.
• Indexes are unique numbers assigned to each item in a Tuple to identify them
• Index always begins from 0 and written in square brackets “[]”.

Example:

Tuple is Immutable

• Yes Tuple is Immutable.
• Content of the Tuple cannot be changed after it has been created.

Example:

Tuple operations

Tuple supports following operations:

• Concatenation
• Repetition
• Membership
• Slicing

Concatenation

• Concatenation refers to joining two Tuple.
• Plus (‘+’) is used as concatenation operator.
• Concatenation operator can also be used for extending an existing tuple.

Example:

Repetition

• Repetition as it name implies used to repeat elements of  a Tuple at specified no of times.
• Asterisk (‘*’) is used as repetition operator.

Membership

• Membership operation refers to checking an item exists in Tuple or not.
• Python uses ‘in’ and ‘not in’ as membership operator.
• ‘in’ returns true if the item specified present in the Tuple.
• ‘not in’ returns true if the item specified present in the Tuple.

Example:

Slicing

• Extracting a subset of items from given Tuple is called slicing
• Subset occurred after slicing contains contiguous items.
• Slicing is done using index range like Tuple[start_index : end_index : step_value]
• End index is always excluded in resultant subset of Tuple.
• Negative index can also be used for slicing.

Examples:

Traversing a Tuple

• Traversing a Tuple refers to accessing each item a given Tuple sequentially.
• for or while loop can be used for traversing a Tuple.

Examples:

Tuple Methods and Built in Functions

Nested Tuple

One Tuple appears as an element inside another Tuple.

Example:

Tuple Assignment

Tuple Assignment allows elements of tuple on the left side of assignment operator to be assigned respective values from a tuple on the right side.