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Collections

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Reference:docs.python.org

Usage ​

Named tuple ​

python
from collections import namedtuple

First create a Class-like object with the desired fields:

python
QueryResult = namedtuple('QueryResult', ['id', 'name', 'status'])

Create instances and use it:

python
tom = QueryResult(id=1, name='Tom', status='active')
tom.id

There is no way to update an instance of a namedtuple, but it is possible to create a copy with only some fields replaced:

python
inactive_tom = tom._replace(status='inactive')

Counter ​

To count the number of occurrences of an element, use collections.Counter.

python
from collections import Counter

Useful, for example, to check if two lists have the same elements regardless of order:

python
Counter(list1) == Counter(list2)