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python skills
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| if key not in my_dict: | |
| my_dict[key] = [] | |
| my_dict[key].append(new_value) | |
| # 等价于 | |
| my_dict.setdefault(key, []).append(new_value) | |
| # 等价于 | |
| import collections | |
| my_dict = collections.defaultdict(list) | |
| my_dict[key].append(new_value) | |
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