diff应该给出期望的结果：
>>> df.diff()count_a count_b2015-01-01 NaN NaN2015-01-02 38465 NaN2015-01-03 36714 NaN2015-01-04 35137 NaN2015-01-05 35864 NaN....2015-02-07 142390 255522015-02-08 126768 228352015-02-09 122324 21485
diff应该给出期望的结果：
>>> df.diff()count_a count_b2015-01-01 NaN NaN2015-01-02 38465 NaN2015-01-03 36714 NaN2015-01-04 35137 NaN2015-01-05 35864 NaN....2015-02-07 142390 255522015-02-08 126768 228352015-02-09 122324 21485
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