回答編集履歴
1
コメントに応じてサンプル修正
answer
CHANGED
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@@ -21,4 +21,31 @@
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21
21
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#2 1 15 22 15.0
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22
22
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#3 2 15 23 23.0
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23
23
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#4 3 15 23 NaN
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24
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```
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---
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**【修正分】**
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28
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29
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```Python
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30
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import pandas as pd
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31
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import io
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32
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33
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data = """A,US,JP
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34
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0,14,22
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35
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newyork,14,22
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newyork,15,22
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37
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tokyo,15,23
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london,15,23
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"""
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df = pd.read_csv(io.StringIO(data))
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conv = {'newyork': 'US', 'tokyo': 'JP', 'London':'UK'}
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df['X'] = df.apply(lambda r: r.get(conv.get(r.A)), axis=1)
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print(df)
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# A US JP X
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#0 0 14 22 NaN
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#1 newyork 14 22 14.0
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48
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#2 newyork 15 22 15.0
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#3 tokyo 15 23 23.0
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50
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#4 london 15 23 NaN
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```
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