xorbits.pandas.DataFrame.values#

property DataFrame.values#

Return a Numpy representation of the DataFrame.

警告

We recommend using DataFrame.to_numpy() instead.

Only the values in the DataFrame will be returned, the axes labels will be removed.

返回: The values of the DataFrame.
返回类型: numpy.ndarray

参见

DataFrame.to_numpy: Recommended alternative to this method.
DataFrame.index: Retrieve the index labels.
DataFrame.columns: Retrieving the column names.

提示

The dtype will be a lower-common-denominator dtype (implicit upcasting); that is to say if the dtypes (even of numeric types) are mixed, the one that accommodates all will be chosen. Use this with care if you are not dealing with the blocks.

e.g. If the dtypes are float16 and float32, dtype will be upcast to float32. If dtypes are int32 and uint8, dtype will be upcast to int32. By numpy.find_common_type() convention, mixing int64 and uint64 will result in a float64 dtype.

实际案例

A DataFrame where all columns are the same type (e.g., int64) results in an array of the same type.

>>> df = pd.DataFrame({'age':    [ 3,  29],  
...                    'height': [94, 170],
...                    'weight': [31, 115]})
>>> df  
   age  height  weight
0    3      94      31
1   29     170     115
>>> df.dtypes  
age       int64
height    int64
weight    int64
dtype: object
>>> df.values  
array([[  3,  94,  31],
       [ 29, 170, 115]])

A DataFrame with mixed type columns(e.g., str/object, int64, float32) results in an ndarray of the broadest type that accommodates these mixed types (e.g., object).

>>> df2 = pd.DataFrame([('parrot',   24.0, 'second'),  
...                     ('lion',     80.5, 1),
...                     ('monkey', np.nan, None)],
...                   columns=('name', 'max_speed', 'rank'))
>>> df2.dtypes  
name          object
max_speed    float64
rank          object
dtype: object
>>> df2.values  
array([['parrot', 24.0, 'second'],
       ['lion', 80.5, 1],
       ['monkey', nan, None]], dtype=object)

This docstring was copied from pandas.core.frame.DataFrame.