Data Types

Before starting with arrays you must know the concept of mutability. An object may be classified into two categories :
i. Mutable
ii. Immutable

Mutable are those objects whose value can be altered after assigning a particular value. Immutable are those objects whose value can not be altered after assigning of a value.
List And Dictionary are Mutable.
Tuples are Immutable.

Data Type Character

i.List Mutable
ii.Tuple Immutable
iii.Dictionary Mutable

LIST

It is a collection of data in which date is stored in ordered form.
Syntax : object_name = [ elements ]
The above mentioned syntax is of list where the elements are mentioned in square brackets.

Program:



Output

['apple', 'banana', 'cherry']

Tuple

A tuple is a collection of data which is mostly similar to a list except that it is immutable i.e. the value once stored in a tuple cannot be changed. Though tuple allows concatenation. Syntax : object_name = ( elements )
This is the syntax of a tuple, where elements are placed under parenthesis.

Program:



Output:

('apple', 'banana', 'cherry')

Tuples allow duplicate values:

Program:



Output:

('apple', 'banana', 'cherry','apple')

Dictionary

Dictionary is a collection of data which is not sequential like a list, thus indexing is not possible. It consists of a key and its value.
Example : dict1 = {1 : "Red", 2 : "Blue", 3 : "Green"}
The above syntax is for a dictionary where the elements are placed under curly brackets.

Program:



Output:

{'brand': 'Ford', 'model': 'Mustang', 'year': 1964}

Duplicates are not allowed in dictionary.

Program



Output

{'brand': 'Ford', 'model': 'Mustang', 'year': 2020}

Duplicate values will overwrite existing values