Round a DataFrame to a variable number of decimal places.
New in version 0.17.0.
>>> df = pd.DataFrame(np.random.random([3, 3]),
... columns=['A', 'B', 'C'], index=['first', 'second', 'third'])
>>> df
A B C
first 0.028208 0.992815 0.173891
second 0.038683 0.645646 0.577595
third 0.877076 0.149370 0.491027
>>> df.round(2)
A B C
first 0.03 0.99 0.17
second 0.04 0.65 0.58
third 0.88 0.15 0.49
>>> df.round({'A': 1, 'C': 2})
A B C
first 0.0 0.992815 0.17
second 0.0 0.645646 0.58
third 0.9 0.149370 0.49
>>> decimals = pd.Series([1, 0, 2], index=['A', 'B', 'C'])
>>> df.round(decimals)
A B C
first 0.0 1 0.17
second 0.0 1 0.58
third 0.9 0 0.49
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