pandas :FutureWarning:将类似列表的内容传递给.loc或[] [英] Pandas: FutureWarning: Passing list-likes to .loc or []

问题描述

运行脚本时，Pandas提供以下信息:未来警告"

When I run my script, Pandas gives the following: 'Future warning'

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"，将出现相同的警告.我不知道如何重新编制索引?

The same warning appear if "ignore_index=False". I don't know how to reindex?

推荐答案

似乎需要Series构造函数才能正确追加新行:

It seems need Series constructor for correct append new row:

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

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