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""" approaches 1 & 2 work on the standard dic"""
# approach 1: via dict.get()
dict default
dict.get('key', 'default')  # fallback insted of KeyError handling

# approach 2: via setdefault()
dict default
default.setdefault('my default value')

# approach 3: via defaultdic
from collections import defaultdict

ice_cream = defaultdict(lambda: 'default_value')