pandas基础（第一章（二））

1.在行或列追加（相当于append的功能）

　　1.1使用.loc追加一行

import pandas as pd
df = pd.read_csv('20190708.csv')
dfa = df.iloc[[0,1,2,3],[1,2,3,4]]
dfa.index = ['a','b','c','d']
print(dfa)
##追加一行
dfa.loc['e',:] = dfa.loc['d',:]
print(dfa)

  

　　1.2使用.loc追加一列

import pandas as pd
import numpy as np
df = pd.read_csv('20190708.csv')
dfa = df.iloc[[0,1,2,3],[1,2,3,4]]
dfa.index = ['a','b','c','d']
print(dfa)
##追加一列
dfa.loc[:,'add_column'] = 6
print(dfa)

 

 　　1.3通过[]追加一列

import pandas as pd
import numpy as np
df = pd.read_csv('20190708.csv')
dfa = df.iloc[[0,1,2,3],[1,2,3,4]]
dfa.index = ['a','b','c','d']
print(dfa)
##追加一列
dfa['add_column'] = 6
print(dfa)