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《流畅的python 第一章 python数据模型》
第一章 python数据模型 摘要：本章主要讲一些特殊方法（前后带双下划线写法的方法，如__len__，__getitem__），为什么有特殊方法，特殊方法的应用。 特殊方法 python是一种面向对象语言，那么为什么会有len(x)这种写法，而不是x.len()呢 Python 解释器遇到len()这种特殊句法时，会使用特殊方法去一摞Python风格纸牌
import collections # 引入collections模块 Card = collections.namedtuple('Card', ['rank', 'suit']) # 用namedtuple创造了一个简单的类Card class FrenchDeck: ranks = [str(n) for n in range(2, 11)] + list('JQKA') # 使用列表操作生成字符串ggplot2（9） 数据操作
9.1 plyr包简介 ddply {plyr}: Split data frame, apply function, and return results in a data frame. ddply(.data, .variables, .fun = NULL, ..., .progress = "none", .inform = FALSE, .drop = TRUE, .parallel = FALSE, .paropts = NULL) .data：用来作图的数据。 .vaR语言：lattice程序包
R语言：lattice程序包lattice程序包实例 lattice程序包 lattice程序包主要用于处理结构稍稍复杂一些的数据集，入门容易，作图速度较快，图形函数种类较多，还可以进行三维绘图。 lattice程序包中主要的函数如下： 实例 调用程序包ggplot2中的diamonds数据集，该数据集包括了砖石的重量、PAT Advanced 1044 Shopping in Mars (25) [⼆分查找]
题目 Shopping in Mars is quite a diferent experience. The Mars people pay by chained diamonds. Each diamond has a value (in Mars dollars M). When making the payment, the chain can be cut at any position for only once and some of the diamonds are taken of th1044 Shopping in Mars (25分)(二分查找)
Shopping in Mars is quite a different experience. The Mars people pay by chained diamonds. Each diamond has a value (in Mars dollars M$). When making the payment, the chain can be cut at any position for only once and some of the diamonds are taken off th1044 Shopping in Mars (25 point(s)) - C语言 PAT 甲级
1044 Shopping in Mars (25 point(s)) Shopping in Mars is quite a different experience. The Mars people pay by chained diamonds. Each diamond has a value (in Mars dollars M$). When making the payment, the chain can be cut at any position for only once an1044 Shopping in Mars (25 分)
1044 Shopping in Mars (25 分) Shopping in Mars is quite a different experience. The Mars people pay by chained diamonds. Each diamond has a value (in Mars dollars M$). When making the payment, the chain can be cut at any position for only once and some英语DYAMAUND钻石DYAMAUND单词
dyamaundand the English words dyamaund The Vertu of the Dyamaund": Gemstones, Knowledge and Value in The Book of John Mandeville and if the dyamaund be good A few years ago a leading US business magazine described the diamond cartel, ... mant’ and t1044 Shopping in Mars （25 分）二分查找
1044 Shopping in Mars （25 分） Shopping in Mars is quite a different experience. The Mars people pay by chained diamonds. Each diamond has a value (in Mars dollars M$). When making the payment, the chain can be cut at any position for only once and some