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Classe « DataFrame »

Méthode pandas.DataFrame.memory_usage

Signature de la méthode memory_usage

def memory_usage(self, index: 'bool' = True, deep: 'bool' = False) -> 'Series' 

Description

help(DataFrame.memory_usage)

Return the memory usage of each column in bytes.

The memory usage can optionally include the contribution of
the index and elements of `object` dtype.

This value is displayed in `DataFrame.info` by default. This can be
suppressed by setting ``pandas.options.display.memory_usage`` to False.

Parameters
----------
index : bool, default True
    Specifies whether to include the memory usage of the DataFrame's
    index in returned Series. If ``index=True``, the memory usage of
    the index is the first item in the output.
deep : bool, default False
    If True, introspect the data deeply by interrogating
    `object` dtypes for system-level memory consumption, and include
    it in the returned values.

Returns
-------
Series
    A Series whose index is the original column names and whose values
    is the memory usage of each column in bytes.

See Also
--------
numpy.ndarray.nbytes : Total bytes consumed by the elements of an
    ndarray.
Series.memory_usage : Bytes consumed by a Series.
Categorical : Memory-efficient array for string values with
    many repeated values.
DataFrame.info : Concise summary of a DataFrame.

Notes
-----
See the :ref:`Frequently Asked Questions <df-memory-usage>` for more
details.

Examples
--------
>>> dtypes = ['int64', 'float64', 'complex128', 'object', 'bool']
>>> data = dict([(t, np.ones(shape=5000, dtype=int).astype(t))
...              for t in dtypes])
>>> df = pd.DataFrame(data)
>>> df.head()
   int64  float64            complex128  object  bool
0      1      1.0              1.0+0.0j       1  True
1      1      1.0              1.0+0.0j       1  True
2      1      1.0              1.0+0.0j       1  True
3      1      1.0              1.0+0.0j       1  True
4      1      1.0              1.0+0.0j       1  True

>>> df.memory_usage()
Index           128
int64         40000
float64       40000
complex128    80000
object        40000
bool           5000
dtype: int64

>>> df.memory_usage(index=False)
int64         40000
float64       40000
complex128    80000
object        40000
bool           5000
dtype: int64

The memory footprint of `object` dtype columns is ignored by default:

>>> df.memory_usage(deep=True)
Index            128
int64          40000
float64        40000
complex128     80000
object        180000
bool            5000
dtype: int64

Use a Categorical for efficient storage of an object-dtype column with
many repeated values.

>>> df['object'].astype('category').memory_usage(deep=True)
5244

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