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<title>kizzy的个人博客 - 流畅的python-序列结构</title>
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<h1>流畅的python-序列结构</h1>
Sat 13 June 2020
by <a class="url fn" href="https://kuikui.tech/author/kizzy.html">kizzy</a>
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<div><p>对于处理序列数据，无论是哪种数据结构，他们共用一套丰富的操作：迭代，切片，排序，还有拼接。</p>
<p>python标准库用C实现了丰富的序列类型：
容器序列: list、tuple以及collection.deque可以存放不同的类型的数据。
扁平序列：str、bytes以及bytearray,memmoryview和array.array，这类序列只能容纳一种类型。
容器序列存放的是他们包含的任意类型的对象的引用，而扁平序列存放的是值而不是引用。
可变序列：list, bytearray, array.array, collections.deque和memoryview
不可变序列: tuple, str 和 bytes</p>
<p>列表推导：a = [b for b in b] python2中会修改b的值为b[-1], 而python3的局部作用域不会。
生成笛卡尔积的eg: a = [(b,c) for b in b for c in c]
生成器表达式: tuple(), 生成器表达式逐个产出元素，不会一次性产出多个列表。</p>
<p>Python sort的原理：非数字的字符排序: key = str.lower / key = len，bisect和insort使用二分查找有序序列来查找和插入。
这章好无聊。。。。。。。。。。。。。</p></div>
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