python-dependency-injector/examples/readme/providers.py

"""`NewInstance` and `Singleton` providers example."""

from objects.providers import NewInstance
from objects.providers import Singleton


# NewInstance provider creates new instance of specified class on every call.
new_object = NewInstance(object)

object_1 = new_object()
object_2 = new_object()

assert object_1 is not object_2

# Singleton provider creates new instance of specified class on first call
# and returns same instance on every next call.
single_object = Singleton(object)

single_object_1 = single_object()
single_object_2 = single_object()

assert single_object_1 is single_object_2