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![A snippet of code showing how `dict.setdefault` works.
This is the code:
values = [(0, 0), (0, 1), (1, 3), (0, 2), (1, 5)]
my_dict = {}
for key, value in values:
my_dict.setdefault(key, []).append(value)
print(my_dict) # {0: [0, 1, 2], 1: [3, 5]}](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:4642ovs4svxe3k3echdm4rks/bafkreiawpxroz2hf2p7iic2nnxruloohdnqf5k35u5xa4g47yplsag6vdq)
