Sets

Set is a collection containing only unique elements.

Creation

Empty Set

emptySet = set()

Inserting Data

Insertion is done via the add function. Like in the following example:

cities = set() cities.add("Tokyo") cities.add("Chicago") cities.add("Tokyo") cities.add("Madrid") print(cities)

Output:

{'Chicago', 'Madrid', 'Tokyo'}

Notice that Tokyo is contained only once, since no duplicates are allowed.

Size

Size is the count of Set's elements. It's accessed via the len function.

names = set() names.add("John") names.add("Smith") names.add("Smith") names.add("Bell") print(len(names))

Output:

3

Remove Element

Certain values can be removed via the remove function.

names = set() names.add("Emily") names.add("Lily") names.add("Teo") names.remove("Teo") print(names)

Output:

{'Lily', 'Emily'}

Contains

A value can be checked if contained via the in keyword.

names = set() names.add("Leo") names.add("Shone") names.add("Alice") print("Shone" in names)

Output:

True

Loop Through

It can be iterated via for in loop:

makes = set() makes.add("Volvo") makes.add("Ford") makes.add("Audi") for m in makes: print(m)

Output:

Audi Volvo Ford