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| 区块链到底能有什么实质应用？
1 区块链 • kaitolucifer • Aug 4, 2018 • Lastly replied by wjo
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Oct 22, 2020 Replied to a topic by JCZ2MkKb5S8ZX9pq › Python › Python 多个列表相加怎么写 |
The issue of quadratic performance of sum(sequences, null_seq) is known, which is why the doc says that sum() is for numbers and recommends .join for strings and itertools.chain for other sequences.
上面那个 sum trick 貌似很慢？
上面那个 sum trick 貌似很慢？
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