回答編集履歴
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コード修正
answer
CHANGED
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@@ -17,6 +17,11 @@
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17
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df = pd.DataFrame(data, columns=['src','idx']) # 分割済み単語のタプルと元配列位置
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df['key'] = df['src'].apply(lambda e:e[:-1]) # 検索用のキー＝末尾の単語を除いたもの
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# 結合用の列値をタプルからID（数値）に最適化
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dic = {e:i for i,e in enumerate(set(df['src']) | set(df['key']))}
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df['src'] = df['src'].apply(dic.get)
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df['key'] = df['key'].apply(dic.get)
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# 左結合
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dfm = df.merge(df, left_on='src', right_on='key', how='left')
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