回答編集履歴
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修正
test
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In [2]: df1 = pd.DataFrame({'Label':['img061c.jpg', 'img061c.jpg', 'img061c.jpg', 'img061c.jpg', 'img061c.jpg'
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In [2]: df1 = pd.DataFrame({'Label':['img061c.jpg', 'img061c.jpg', 'img061c.jpg', 'img061c.jpg', 'img061c.jpg']})
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...: ]})
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In [3]: df2 = pd.DataFrame({'PictureNumber':['img061c.jpg', 'img062c.jpg', 'img063c.jpg'], 'SumpleNumber':['く
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In [3]: df2 = pd.DataFrame({'PictureNumber':['img061c.jpg', 'img062c.jpg', 'img063c.jpg'], 'SumpleNumber':['くるみ豆', '金持ち豆', '秘伝豆'], 'BeenNumber':['B2', 'B3', 'B4']})
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...: るみ豆', '金持ち豆', '秘伝豆'], 'BeenNumber':['B2', 'B3', 'B4']})
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In [6]: df3 = pd.merge(df1, df2, left_on='Label', right_on='PictureNumber', how='left').drop('PictureNumber',
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In [6]: df3 = pd.merge(df1, df2, left_on='Label', right_on='PictureNumber', how='left').drop('PictureNumber', axis=1)
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...: axis=1)
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追記
test
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df3 = pd.merge(df1, df2, on='PictureNumber', how='left')
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```
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[追記]
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```python
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In [1]: import pandas as pd
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In [2]: df1 = pd.DataFrame({'Label':['img061c.jpg', 'img061c.jpg', 'img061c.jpg', 'img061c.jpg', 'img061c.jpg'
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...: ]})
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In [3]: df2 = pd.DataFrame({'PictureNumber':['img061c.jpg', 'img062c.jpg', 'img063c.jpg'], 'SumpleNumber':['く
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...: るみ豆', '金持ち豆', '秘伝豆'], 'BeenNumber':['B2', 'B3', 'B4']})
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In [4]: df1
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Out[4]:
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Label
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0 img061c.jpg
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1 img061c.jpg
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2 img061c.jpg
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3 img061c.jpg
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In [5]: df2
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Out[5]:
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PictureNumber SumpleNumber BeenNumber
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0 img061c.jpg くるみ豆 B2
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1 img062c.jpg 金持ち豆 B3
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2 img063c.jpg 秘伝豆 B4
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In [6]: df3 = pd.merge(df1, df2, left_on='Label', right_on='PictureNumber', how='left').drop('PictureNumber',
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...: axis=1)
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In [7]: df3
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Out[7]:
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Label SumpleNumber BeenNumber
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0 img061c.jpg くるみ豆 B2
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1 img061c.jpg くるみ豆 B2
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2 img061c.jpg くるみ豆 B2
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3 img061c.jpg くるみ豆 B2
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4 img061c.jpg くるみ豆 B2
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```
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