Pandas使用教程（三）：一些常见小问题

1.what about reading from csv file only two columns？

2.iterrows()

3.what’s the best way to drop every non-numeric column from a DataFrame?

axis参数：0等同index，1等同columns

4.How to use string method in pandas?

bonus1

orders.choice_description.str.replace(’[’,’’).str.replace(’]’,’’)

等同于：

orders.choice_description.str.replace(’[ \ [ \ ] ]’,’’)

5.How to change the data type of a pandas Series?

在读取csv文件时指定类型：

6.When should I use a “groupby” in pandas?

agg( [ ] )
可视化：%matplotlib inline