countertype 1.2.2

countertype

A small collection to index objects using tags. Type-safe.

Installation

pip install countertype

Usage

You can add any hashable items into the collection using tags. Let’s add two string values, "ev1", and "ev2". Each element must have at least one tag, called id, that identifies that object. Ids must be unique inside the collection, and can’t be changed later. Regular tags can be updated.

from countertype import CounterType

ct: CounterType[str] = CounterType()

ct.put(
    "ev1",
    id="1",
    state="RUNNING",
    parent="ev_parent",
)
ct.put(
    "ev2",
    id="2",
    state="STOPPED",
    parent="ev_parent",
)

To find elements we can search by any of the defined tags, using the **kw:

Let’s find all the elements with the state tag set to "STOPPED":

ct.find_all(state="STOPPED")

This will return an iterable with all the matching elements.

To find a single element, we can fetch it again, as an Optional:

ct.find(state="STOPPED")

Multiple tags are also supported, and will intersect the potential matches:

ct.find(state="STOPPED", parent_id="123")

Updating tags for existing items is also possible, by using the item id. Of course, multiple tags could be updated.

ct.update(id="1", state="PROCESSING")

To remove an element from the collection, pass its id in the remove function:

ct.remove(id="1")