November 2022
Intermediate to advanced
392 pages
10h 8m
Chinese
Content preview from Python算法交易
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342
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附录
In [55]: d.keys()
Out[55]: dict_keys(['int_obj', 'float_obj', 'string_obj', 'int_obj_long'])
In [56]: d.values()
Out[56]: dict_values([3, 5.0, 'Python Trading', 100000000000000000000])
使用大括号和键值对创建一个
dict
对象。
访问给定键的值。
添加新的键值对。
选择并显示所有键。
选择并显示所有值。
控制结构
迭代是一般编程特别是金融分析中非常重要的操作。许多
Python
对象是可迭代的，
这在许多情况下都非常方便。比如特殊的迭代器对象“范围”（
range
）。
In [57]: range(5)
Out[57]: range(0, 5)
In [58]: range(3, 15, 2)
Out[58]: range(3, 15, 2)
In [59]: for i in range(5):
print(i ** 2, end=' ')
0 1 4 9 16
In [60]: for i in range(3, 15, 2):
print(i, end=' ')
3 5 7 9 11 13
In [61]: l = ['a', 'b', 'c', 'd', 'e']
In [62]: for _ in l:
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