1In [8]: df4 = pd.DataFrame({'B': ['B2', 'B3', 'B6', 'B7'],
2 ...: 'D': ['D2', 'D3', 'D6', 'D7'],
3 ...: 'F': ['F2', 'F3', 'F6', 'F7']},
4 ...: index=[2, 3, 6, 7])
5 ...:
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7In [9]: result = pd.concat([df1, df4], axis=1, sort=False)
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