BLOCKS

摘要：墙内访问youtube没有特别好的方法，只找到一个，提供格式转换和下载：http://new.cloudfile.co/transfer1. 修改host文件，照常用网页访问。有人会提供最新host文件：http://blog.my-eclipse.cn/host-google.html2. 网页可... 阅读全文

摘要：基于pandas求和。column_list = ['Fiber_TD_(g)', 'Sugar_Tot_(g)']# Let's sum up the total amount of fiber and sugar across all the foods.total = food_info[co... 阅读全文

摘要：基于pandasall_columns = list(food_info.columns.values)#the first two columns don't need to be normalizedall_columns = all_columns[2:len(all_columns)]for... 阅读全文

摘要：基于pandasascending_fat_then_ascending_sodium = food_info.sort(["Lipid_Tot_(g)", "Sodium_(mg)"], ascending=[True, True])#get the first three food top_th... 阅读全文

摘要：----------------基于numpyworld_alcolhol是numpy的array类型。输入：matrix； 输出：matrix# Boolean vector corresponding to Canada and 1986.canada_1986_boolean = (world... 阅读全文

摘要：基于pandas直接相加# Adding up all of the fat columns.# food_info is a dataframe# Adding two columns will go through and add each value at each position to t... 阅读全文

摘要：python本身方法：f=open("xx.csv","r")b=f.read()rows=b.split('\n')full_data = []for row in rows: cols_in_a_row=row.split(',') full_data.append(cols_in_... 阅读全文

摘要：#input is a list named legislators, the first two elements looks like this:#[['Bassett', 'Richard', '1745-04-02', 'M', 'sen', 'DE', 'Anti-Administrati... 阅读全文

摘要：----------------基于普通python#first two elements of list legislators.#[['Bassett', 'Richard', '1745-04-02', 'M', 'sen', 'DE', 'Anti-Administration', '174... 阅读全文

摘要：#input is a list named legislators, the first two elements looks like this:#[['Bassett', 'Richard', '1745-04-02', 'M', 'sen', 'DE', 'Anti-Administrati... 阅读全文

摘要：dataquest上第一个challenge，很简单，但是也可以得到一般的数据处理过程。 这个challenge是从一个csv文件中读入名字和使用的人数，需要得到使用人数大于1000的名字。 1. 读入数据。(open,read) 2. 存储到合适的数据结构中。（split into list... 阅读全文

摘要：可汗统计课56 We're trying to test whether a new, low-fat diet actually helps obese people lose weight. 100 randomly assigned obese people are assigned to g 阅读全文

摘要：$\vec{a} \cdot \vec{b}=0$ 阅读全文

摘要：前几天看王垠的一篇文章谈数学与编程，说数学公式之所以难以理解是因为缺乏统一的形式，而且经常有未定义的变量出现。看这本书时也正有此感，所以有时不必要拘泥公式是否前后一致，理解意思要紧。♣普通最小二乘法ordinary least squares,OLSŶi=β1+β2Xiûi=Yi-Ŷi(加帽表示这是... 阅读全文