Set methods

add

Method add adds an item to set:

In [1]: set1 = {10,20,30,40}

In [2]: set1.add(50)

In [3]: set1
Out[3]: {10, 20, 30, 40, 50}

discard

Method discard allows deleting elements without showing an error if there is no element in set:

In [3]: set1
Out[3]: {10, 20, 30, 40, 50}

In [4]: set1.discard(55)

In [5]: set1
Out[5]: {10, 20, 30, 40, 50}

In [6]: set1.discard(50)

In [7]: set1
Out[7]: {10, 20, 30, 40}

clear

Method clear empties set:

In [8]: set1 = {10,20,30,40}

In [9]: set1.clear()

In [10]: set1
Out[10]: set()