我有一个如下所示的数据框:
from random import randint
import pandas as pd
df = pd.DataFrame({"ID": ["a", "b", "c", "d", "e", "f", "g"],
"Size": [randint(0,9) for i in range(0,7)]})
df
ID Size
0 a 4
1 b 3
2 c 0
3 d 2
4 e 9
5 f 5
6 g 3
而我想要获得的是(也可以是一个矩阵):
sums_df
a b c d e f g
a 8.0 7.0 4.0 6.0 13.0 9.0 7.0
b 7.0 6.0 3.0 5.0 12.0 8.0 6.0
c 4.0 3.0 0.0 2.0 9.0 …