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Python pandas.DataFrame.to_xarray用法及代碼示例


用法:

DataFrame.to_xarray()

從 pandas 對象返回一個 xarray 對象。

返回

xarray.DataArray 或 xarray.Dataset

如果對象是 DataFrame,則 pandas 結構中的數據轉換為 Dataset,如果對象是 Series,則轉換為 DataArray。

注意

請參閱 xarray 文檔

例子

>>> df = pd.DataFrame([('falcon', 'bird', 389.0, 2),
...                    ('parrot', 'bird', 24.0, 2),
...                    ('lion', 'mammal', 80.5, 4),
...                    ('monkey', 'mammal', np.nan, 4)],
...                   columns=['name', 'class', 'max_speed',
...                            'num_legs'])
>>> df
     name   class  max_speed  num_legs
0  falcon    bird      389.0         2
1  parrot    bird       24.0         2
2    lion  mammal       80.5         4
3  monkey  mammal        NaN         4
>>> df.to_xarray()
<xarray.Dataset>
Dimensions:   (index:4)
Coordinates:
  * index      (index) int64 0 1 2 3
Data variables:
    name       (index) object 'falcon' 'parrot' 'lion' 'monkey'
    class      (index) object 'bird' 'bird' 'mammal' 'mammal'
    max_speed  (index) float64 389.0 24.0 80.5 nan
    num_legs   (index) int64 2 2 4 4
>>> df['max_speed'].to_xarray()
<xarray.DataArray 'max_speed' (index:4)>
array([389. ,  24. ,  80.5,   nan])
Coordinates:
  * index    (index) int64 0 1 2 3
>>> dates = pd.to_datetime(['2018-01-01', '2018-01-01',
...                         '2018-01-02', '2018-01-02'])
>>> df_multiindex = pd.DataFrame({'date':dates,
...                               'animal':['falcon', 'parrot',
...                                          'falcon', 'parrot'],
...                               'speed':[350, 18, 361, 15]})
>>> df_multiindex = df_multiindex.set_index(['date', 'animal'])
>>> df_multiindex
                   speed
date       animal
2018-01-01 falcon    350
           parrot     18
2018-01-02 falcon    361
           parrot     15
>>> df_multiindex.to_xarray()
<xarray.Dataset>
Dimensions: (animal:2, date:2)
Coordinates:
  * date     (date) datetime64[ns] 2018-01-01 2018-01-02
  * animal   (animal) object 'falcon' 'parrot'
Data variables:
    speed    (date, animal) int64 350 18 361 15

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注:本文由純淨天空篩選整理自pandas.pydata.org大神的英文原創作品 pandas.DataFrame.to_xarray。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。