熊猫：FutureWarning：将列表喜欢传递给 .loc 或 [] [重复]

Question

当我运行我的脚本时，Pandas 会给出以下信息：“未来警告”

FutureWarning:
Passing list-likes to .loc or [] with any missing label will raise
KeyError in the future, you can use .reindex() as an alternative. 

我的脚本：

import io

data = io.StringIO('''A,B,M
AM,1,
AMC,2,
''')
df = pd.read_csv(data)

r=['CAR']
s=['CAR_M']

for i,j in zip(r,s):
    df=df.append([{'A':i,'M':j}], ignore_index=True)

如果“ignore_index=False”，也会出现同样的警告。我不知道如何重新索引？

Answer 1

似乎需要Series 构造函数才能正确追加新行：

for i,j in zip(r,s):
    df=df.append(pd.Series({'A':i,'M':j}), ignore_index=True)

print (df)
     A    B      M
0   AM  1.0    NaN
1  AMC  2.0    NaN
2  CAR  NaN  CAR_M