Initializing python Defaultdict

Question

Is there a way to initialize a dict the following way:

component_map = {}
component_map[component] = {'in': [], 'out': [], 'degree': 0}

For example, I can create a defaultdict that will give me a [] by default, like this:

from collections import defaultdict
component_map = defaultdict(list)
component_map['component']
# []

How would I initialize it so that calling component_map['component'] returns {'in': [], 'out': [], 'degree': 0} ?

Answer 1

Like this:

component_map = defaultdict(lambda: {'in': [], 'out': [], 'degree': 0})