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2018-02-28数据结构和算法(1) 1.1解压序列赋值给多个变量: 任何的序列(或者是可迭代对象)可以通过一个简单的赋值语句解压并赋值给多个变量. 唯一的前提就是变量的数量必须跟序列元素的数量是一样的. >>> data = [ 'ACME', 50, 91.1, (2012, 12, 21) ] >>> name, shares, price, date = data >>> name 'ACME' 此方法需要注意变量个数和序列元素个数的匹配,…

2018-03-01数据结构与算法(4) 1.16过滤序列元素 最简单的过滤序列元素的方法就是使用列表推导.比如: >>> mylist = [1, 4, -5, 10, -7, 2, 3, -1] >>> [n for n in mylist if n > 0] [1, 4, 10, 2, 3] >>> [n for n in mylist if n < 0] [-5, -7, -1] >>> 用列表推导的一个潜在缺陷就…

2018-03-01数据结构和算法(3) 1.11 命名切片 假定你有一段代码要从一个记录字符串中几个固定位置提取出特定的数据字段(比如文件或类似格式): ###### 0123456789012345678901234567890123456789012345678901234567890' record = '....................100 .......513.25 ..........' cost = int(record[20:23]) * float(record[3…

2018-03-01数据结构和算法(2) 1.6字典中的键映射多个值 一个字典就是一个键对应一个单值的映射.如果你想要一个键映射多个值,那么你就需要将这多个值放到另外的容器中, 比如列表或者集合里面.比如,你可以像下面这样构造这样的字典: d = { 'a' : [1, 2, 3], 'b' : [4, 5] } e = { 'a' : {1, 2, 3}, 'b' : {4, 5} } 选择使用列表还是集合取决于你的实际需求.如果你想保持元素的插入顺序就应该使用列表, 如果想去掉重复元素就使用…

https://pyobjc.readthedocs.io/en/latest/ The PyObjC project aims to provide a bridge between the Python and Objective-C programming languages. The bridge is intended to be fully bidirectional, allowing the Python programmer to take full advantage of…

InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings InsecureRequestWarning) 出现这个错误的原因是: requests 库其实是基于 ur…

Beware! Async modes will not speed up your app, they are aimed at improving concurrency. Do not expect that enabling some of the modes will work flawlessly, asynchronous/evented/non-blocking systems require app cooperation, so if your app is develope…