https://study.163.com/course/courseMain.htm?courseId=1006383008&share=2&shareId=400000000398149（博主录制）
https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.filter.html（官网介绍）
DataFrame.filter(self, items=None, like=None, regex=None, axis=None)[source]
Subset rows or columns of dataframe according to labels in the specified index.
Note that this routine does not filter a dataframe on its contents. The filter is applied to the labels of the index.
| Parameters: |
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# -*- coding: utf-8 -*-
"""
Created on Sun Sep 8 11:32:40 2019
@author: QQ231469242
"""
import pandas as pd
import numpy as np
df = pd.DataFrame(np.array(([1, 2, 3], [4, 5, 6])),
index=['mouse', 'rabbit'],
columns=['one', 'two', 'three'])
df.filter(items=['one', 'three'])
#select columns by regular expression
df.filter(regex='e$', axis=1)
# select rows containing 'bbi'
df.filter(like='bbi', axis=0)
https://study.163.com/provider/400000000398149/index.htm?share=2&shareId=400000000398149（博主视频教学主页）
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