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Який результат отримаємо ?                 left = pd.DataFrame({'key': ['A', ...

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Який результат отримаємо ?

                left = pd.DataFrame({'key': ['A', 'B'],  'lval': [1, 2]})

                right = pd.DataFrame({'key': ['A', 'B'],  'rval': [4, 5]}) 

                pd.merge(left, right, on='key')

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