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Set
Set is an unordered collection of elements. Each element of the set is unique and not mutable, but the set itself is mutable.
Sets are created with
<myset> = {<element1>, ...., <element_n>};or with the function set()
<mylist> = set();Since {} are used for dictionaries to define an empty set you must use the function set().
Add
To add an element
<mylist>.add(<element>)To add more elements
<mylist>.update(<element>,<element>,...)Delete
Discard do not throw exception if element does not exists
<mylist>.discard(<element>)Remove throws exception if element does not exists
<mylist>.remove(<element>)Pop removes a random element
<mylist>.pop()<dict>.items() returns a list of couples <key,value>
Collections
Collections are containers used to stores elements. To use collections uses the collections module.
Counter
Counter is a functions that takes as input a list or a dictionary and returns a dictionary which has as keys the elements of the list or the keys of the dictionary and as value the number of occurrence of the elements or keys.
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