Python Sets

• Set is collection of heterogeneous objects where insertion order is never preserved and duplicates are never allowed.

• it does not support slicing and indexing due to unordered element.

• A set created with 'set' is mutable while the one created with 'frozenset' is immutable.

When to use Set

• Unique collection of data store.

When to create a Set

1. st = set ( )                   #Blank Set

2. st = {0}                       #Blank Set