November 2022
Intermediate to advanced
392 pages
10h 8m
Chinese
Content preview from Python算法交易
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Python
、
NumPy
、
matplotlib
和
pandas
｜
343
In [64]: for c in s:
print(c + '|', end='')
P|y|t|h|o|n| |T|r|a|d|i|n|g|
创建一个给定单个参数（结束值
+ 1
）的范围对象。
创建一个具有开始、结束和步长参数值的范围对象。
迭代范围对象并打印平方值。
使用开始、结束和步长参数迭代范围对象。
迭代一个列表对象。
迭代
str
对象。
while
循环跟它们在其他语言中的对应物很类似。
In [65]: i = 0
In [66]: while i < 5:
print(i ** 0.5, end=' ')
i += 1
0.0 1.0 1.4142135623730951 1.7320508075688772 2.0
将计数器值设置为
0
。
只要
i
的值小于
5
……
……打印
i
的平方根……
……将
i
的值增加
1
。
Python
习语
Python
在很多地方依赖于一些特殊的习惯用法。让我们从一个相当流行的列表推导
式开始。
In [67]: lc = [i ** 2 for i in range(10)]
In [68]: lc
Out[68]: [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
344
｜
附录
In [69]: type(lc)
Out[69]: list
基于列表推导式语法（括号中的 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.