Python 创建一个空的DataFrame，并按行写入数据

import pandas as pd 

df = pd.DataFrame(columns = ['A','B','C','D'])

for i in range(4):

   s = pd.Series(['A1','B4', 'C4', 'D4'], index=data.columns, name = i)

   df = df.append(s, ignore_index=True)


print(df)

    A   B   C   D
0  A1  B4  C4  D4
1  A1  B4  C4  D4
2  A1  B4  C4  D4
3  A1  B4  C4  D4