Created
April 7, 2020 04:04
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collections.defaultdict()
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| https://docs.python.org/3/library/collections.html#defaultdict-objects | |
| dd=collections.defaultdict(lambda: [1]) | |
| # defaultdict(<function __main__.<lambda>()>, {}) | |
| xx=dd['1'] | |
| dd | |
| # defaultdict(<function __main__.<lambda>()>, {'1': [1]}) | |
| xx | |
| # [1] | |
| xx[0]=100 | |
| xx | |
| # [100] | |
| dd | |
| # defaultdict(<function __main__.<lambda>()>, {'1': [100]}) |
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