数据帧中loc[]的随机访问

batch_df

import pandas as pd
df = pd.read_csv('test.batch.csv')
print(df)
for i in range(0, len(df), 3):
    print("\n------BATCH BEGIN")
    batch_df = df.iloc[i:i+3]
    print(batch_df)
    print(batch_df.loc[0].at["Name"])
    print("------BATCH END")

输出

   ID Name Metric  Value
0   0   K1     M1     10
1   0   K1     M2      5
2   0   K1     M3     10
3   1   K2     M1     20
4   1   K2     M2     10
5   1   K2     M3     15

------BATCH BEGIN
   ID Name Metric  Value
0   0   K1     M1     10
1   0   K1     M2      5
2   0   K1     M3     10
K1
------BATCH END

------BATCH BEGIN
   ID Name Metric  Value
3   1   K2     M1     20
4   1   K2     M2     10
5   1   K2     M3     15
ERROR ----> 7     print(batch_df.loc[0].at["Name"])
KeyError: 0

print(batch_df.loc[i].at["Name"]) ,但我想知道为什么会发生这种情况,这是否意味着第一批_df没有被覆盖?