Pandas学习笔记（1）Creating, Reading and Writing

Pandas学习笔记（1）Creating, Reading and Writing

有两种核心对象一个是Dataframe,一个是Series

1.创建一个如下的叫做fruits的Dataframe:

import pandas as pd
fruits = pd.Dataframe({'Apples':[30],'Bananas':[21]})

2.创建一个如下的叫做fruit_sales的Dataframe:

fruit_sales = pd.Dataframe({'Apples':[35,41],'Bananas':[21,34]},
index = ['2017 Sales','2018 Sales'])

3.用Series创建一个ingredients如下一样：

ingredients = pd.Series(['4 cups','1 cup','2 large','1 can'],
index = ['Flour','Milk','Eggs','Spam'],name = 'Dinner')

4.读../input/wine-reviews/winemag-data_first150k.csv路径下的csv文件为叫做reviews

reviews = pd.read_csv("../input/wine-reviews/winemag-data_first150k.csv",index_col = 0)

5.创建了一个叫做animals的Dataframe将他保存为CSV格式命名为cows_and_goats.csv

animals.to_csv("cows_and_goats.csv")