November 2022
Intermediate to advanced
392 pages
10h 8m
Chinese
Content preview from Python算法交易
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94
｜
第
3
章
In [112]: res[:5]
Out[112]: [('2021-01-03 19:19:00', 103.6894, 105.0117, 103.9025, 95.8619,
93.6062),
('2021-01-03 19:20:00', 103.6724, 105.0654, 103.9277, 95.8915,
93.5673),
('2021-01-03 19:21:00', 103.6213, 105.1132, 103.8598, 95.7606,
93.5618),
('2021-01-03 19:22:00', 103.6724, 105.1896, 103.8704, 95.7302,
93.4139),
('2021-01-03 19:23:00', 103.8115, 105.1152, 103.8342, 95.706,
93.4436)]
In [113]: len(res)
Out[113]: 5035
In [114]: con.close()
In [115]: rm data/*
将
SQL
查询作为
Python
str
对象。
执行查询以获取所有结果行。
打印出前五个结果。
结果列表对象的长度。
诚然，如果数据集可以放入内存，那么使用
pandas
也能够进行这种简单的查询。但
是，
SQL
查询语言已经在过去数十年间被证明其有用且功能强大，它应该在算法交 ...
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