1.2. Python Data Structures

Data Structures
- List [] is a collection of items in Python which is ordered and changeable.
  - A list holds a sequence of items and allows duplicate members
  - After creating a list in Python, you can search, add, and remove items from the list.
  - A list qualifies for being labeled as a mutable data type because it can be altered by adding or removing elements.
  - X = [item 1, item 2, item 3,….., item n]

Tuple () is a collection of objects which is ordered and unchangeable.
- Tuple is immutable as it can’t be modified
- Allows duplicate members
- X = (item 1, item 2, item 3,….., item n)

Set {} is a collection of objects which is unordered and unindexed
- No duplicate members
- X = {“item 1”, “item 2”, “item 3”,….., “item n”}

Dictionary is a collection of items which is unordered, changeable and indexed.
- A dictionary stores data in the form of key-value pairs and the key defined for a dictionary need to be unique.
- Values in the dictionary can be mutable or immutable objects, and only immutable objects are allowed for keys
- A set is deployed when the existence of an object in a collection is important than the order or the frequency
- No duplicate members
- The object in dictionary cannot be sorted
- X = {key 1 : value 1, key 2 : value 2, key 3 : value 3,…., key n : value n}

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