How to append elements to a collection in python

In Python set is a collection type of basic data type. It has two types: mutable collection (set()) and immutable collection (frozenset). The operations of creating a set, adding a set, deleting a set, intersection, union, and difference are all very practical methods.

Create a collection set (recommended learning: Python video tutorial)

The python set class is in the sets module of python. Everyone In the python2.7.x currently used, sets can be created directly without importing the sets module.

>>>set('boy')
set(['y', 'b', 'o'])

Collection addition

There are two common methods for adding python collections, namely add and update.

Collection add method: is to add the element to be passed in to the collection as a whole, for example:

>>> a = set('boy')
>>> a.add('python')
>>> a
set(['y', 'python', 'b', 'o'])

Collection update method: is to split the element to be passed in, and do Pass the individual into the collection, for example:

>>> a = set('boy')
>>> a.update('python')
>>> a
set(['b', 'h', 'o', 'n', 'p', 't', 'y'])

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