If you call the new round method on a mixed dataframe (not only numerical columns), you get an error:
In [1]: df = pd.DataFrame({'floats':[0.123, 0.156, 5.687], 'strings': ['a', 'b', 'c']})
In [2]: df.round(2)
TypeError: can't multiply sequence by non-int of type 'float'
In [3]: df.round()
AttributeError: 'str' object has no attribute 'rint'
Would it be better to ignore these non-numerical columns instead of raising an error?
Another option would be to drop these columns (like numerical aggregations like df.mean() do).
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