一文教你向Pandas DataFrame添加行_python

#add row to end of DataFrame
df.loc[len(df.index)] = [value1, value2, value3, ...]

#append rows of df2 to end of existing DataFrame
df = df.append(df2, ignore_index = True)

import pandas as pd
 
#create DataFrame
df = pd.DataFrame({'points': [10, 12, 12, 14, 13, 18],
                   'rebounds': [7, 7, 8, 13, 7, 4],
                   'assists': [11, 8, 10, 6, 6, 5]})
 
#view DataFrame
df
 
	points	rebounds assists
0	10	7	 11
1	12	7	 8
2	12	8	 10
3	14	13	 6
4	13	7	 6
5	18	4	 5
 
#add new row to end of DataFrame
df.loc[len(df.index)] = [20, 7, 5]
 
#view updated DataFrame
df
 
        points	rebounds assists
0	10	7	 11
1	12	7	 8
2	12	8	 10
3	14	13	 6
4	13	7	 6
5	18	4	 5
6	20	7	 5

import pandas as pd
 
#create DataFrame
df = pd.DataFrame({'points': [10, 12, 12, 14, 13, 18],
                   'rebounds': [7, 7, 8, 13, 7, 4],
                   'assists': [11, 8, 10, 6, 6, 5]})
 
#view DataFrame
df
 
	points	rebounds assists
0	10	7	 11
1	12	7	 8
2	12	8	 10
3	14	13	 6
4	13	7	 6
5	18	4	 5
 
#define second DataFrame
df2 = pd.DataFrame({'points': [21, 25, 26],
                    'rebounds': [7, 7, 13],
                    'assists': [11, 3, 3]})
 
#add new row to end of DataFrame
df = df.append(df2, ignore_index = True)
 
#view updated DataFrame
df
 
        points	rebounds assists
0	10	7	 11
1	12	7	 8
2	12	8	 10
3	14	13	 6
4	13	7	 6
5	18	4	 5
6	21	7	 11
7	25	7	 3
8	26	13	 3

df['new_colu']='12'#向 DataFrame 添加一列，该列为同一值

df
Out[93]: 
        one two three four new_colu
a         0   1     2    3       12
b         4   5     6    7       12
c         8   9    10   11       12
d        12  13    14   15       12
new_raw   3   3     3    3       12