pandas get row if difference previous

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Camil
03 Oct 2018
1>>> df = pd.DataFrame({'a': [1, 2, 3],
2...                    'b': [1, 1, 2],
3...                    'c': [1, 4, 9]})
4
5>>> df
6   a  b   c
70  1  1   1
81  2  1   4
92  3  2   9
10
11>>> df.diff()
12
13     a    b     c
140  NaN  NaN   NaN
151  1.0  0.0   3.0
162  1.0  1.0   5.0
17
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