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Base and utility classes for pandas objects.
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requested ndim of result
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subset to act on
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Return the transpose, which is by definition self.
Examples
--------
For Series:
>>> s = pd.Series(['Ant', 'Bear', 'Cow'])
>>> s
0 Ant
1 Bear
2 Cow
dtype: object
>>> s.T
0 Ant
1 Bear
2 Cow
dtype: object
For Index:
>>> idx = pd.Index([1, 2, 3])
>>> idx.T
Index([1, 2, 3], dtype='int64')
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Return a tuple of the shape of the underlying data.
Examples
--------
>>> s = pd.Series([1, 2, 3])
>>> s.shape
(3,)
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Number of dimensions of the underlying data, by definition 1.
Examples
--------
>>> s = pd.Series(['Ant', 'Bear', 'Cow'])
>>> s
0 Ant
1 Bear
2 Cow
dtype: object
>>> s.ndim
1
For Index:
>>> idx = pd.Index([1, 2, 3])
>>> idx
Index([1, 2, 3], dtype='int64')
>>> idx.ndim
1
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Return the first element of the underlying data as a Python scalar.
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-------
scalar
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Raises
------
ValueError
If the data is not length = 1.
Examples
--------
>>> s = pd.Series([1])
>>> s.item()
1
For an index:
>>> s = pd.Series([1], index=['a'])
>>> s.index.item()
'a'
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Return the number of bytes in the underlying data.
Examples
--------
For Series:
>>> s = pd.Series(['Ant', 'Bear', 'Cow'])
>>> s
0 Ant
1 Bear
2 Cow
dtype: object
>>> s.nbytes
24
For Index:
>>> idx = pd.Index([1, 2, 3])
>>> idx
Index([1, 2, 3], dtype='int64')
>>> idx.nbytes
24
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Return the number of elements in the underlying data.
Examples
--------
For Series:
>>> s = pd.Series(['Ant', 'Bear', 'Cow'])
>>> s
0 Ant
1 Bear
2 Cow
dtype: object
>>> s.size
3
For Index:
>>> idx = pd.Index([1, 2, 3])
>>> idx
Index([1, 2, 3], dtype='int64')
>>> idx.size
3
)r� r� rA s rC �sizezIndexOpsMixin.size� s � �4 �4�<�<� � rE c � � t | � �)ac
The ExtensionArray of the data backing this Series or Index.
Returns
-------
ExtensionArray
An ExtensionArray of the values stored within. For extension
types, this is the actual array. For NumPy native types, this
is a thin (no copy) wrapper around :class:`numpy.ndarray`.
``.array`` differs from ``.values``, which may require converting
the data to a different form.
See Also
--------
Index.to_numpy : Similar method that always returns a NumPy array.
Series.to_numpy : Similar method that always returns a NumPy array.
Notes
-----
This table lays out the different array types for each extension
dtype within pandas.
================== =============================
dtype array type
================== =============================
category Categorical
period PeriodArray
interval IntervalArray
IntegerNA IntegerArray
string StringArray
boolean BooleanArray
datetime64[ns, tz] DatetimeArray
================== =============================
For any 3rd-party extension types, the array type will be an
ExtensionArray.
For all remaining dtypes ``.array`` will be a
:class:`arrays.NumpyExtensionArray` wrapping the actual ndarray
stored within. If you absolutely need a NumPy array (possibly with
copying / coercing data), then use :meth:`Series.to_numpy` instead.
Examples
--------
For regular NumPy types like int, and float, a NumpyExtensionArray
is returned.
>>> pd.Series([1, 2, 3]).array
<NumpyExtensionArray>
[1, 2, 3]
Length: 3, dtype: int64
For extension types, like Categorical, the actual ExtensionArray
is returned
>>> ser = pd.Series(pd.Categorical(['a', 'b', 'a']))
>>> ser.array
['a', 'b', 'a']
Categories (2, object): ['a', 'b']
r rA s rC �arrayzIndexOpsMixin.array� s � �~ "�$�'�'rE NFc �l � t | j t � r | j j |f||d�|��S |r1t t
|j � � � }t d|� d�� �|t j uxrC |t j u xr. t j | j t j � }| j }|rUt! ||� st j" ||�� }n|j% � }||t j& t) | � � < t j" ||�� }|r|r |sot+ � ret j, | j dd |dd � r?t+ � r%|s#|j/ � }d|j0 _ |S |j% � }|S )a�
A NumPy ndarray representing the values in this Series or Index.
Parameters
----------
dtype : str or numpy.dtype, optional
The dtype to pass to :meth:`numpy.asarray`.
copy : bool, default False
Whether to ensure that the returned value is not a view on
another array. Note that ``copy=False`` does not *ensure* that
``to_numpy()`` is no-copy. Rather, ``copy=True`` ensure that
a copy is made, even if not strictly necessary.
na_value : Any, optional
The value to use for missing values. The default value depends
on `dtype` and the type of the array.
**kwargs
Additional keywords passed through to the ``to_numpy`` method
of the underlying array (for extension arrays).
Returns
-------
numpy.ndarray
See Also
--------
Series.array : Get the actual data stored within.
Index.array : Get the actual data stored within.
DataFrame.to_numpy : Similar method for DataFrame.
Notes
-----
The returned array will be the same up to equality (values equal
in `self` will be equal in the returned array; likewise for values
that are not equal). When `self` contains an ExtensionArray, the
dtype may be different. For example, for a category-dtype Series,
``to_numpy()`` will return a NumPy array and the categorical dtype
will be lost.
For NumPy dtypes, this will be a reference to the actual data stored
in this Series or Index (assuming ``copy=False``). Modifying the result
in place will modify the data stored in the Series or Index (not that
we recommend doing that).
For extension types, ``to_numpy()`` *may* require copying data and
coercing the result to a NumPy type (possibly object), which may be
expensive. When you need a no-copy reference to the underlying data,
:attr:`Series.array` should be used instead.
This table lays out the different dtypes and default return types of
``to_numpy()`` for various dtypes within pandas.
================== ================================
dtype array type
================== ================================
category[T] ndarray[T] (same dtype as input)
period ndarray[object] (Periods)
interval ndarray[object] (Intervals)
IntegerNA ndarray[object]
datetime64[ns] datetime64[ns]
datetime64[ns, tz] ndarray[object] (Timestamps)
================== ================================
Examples
--------
>>> ser = pd.Series(pd.Categorical(['a', 'b', 'a']))
>>> ser.to_numpy()
array(['a', 'b', 'a'], dtype=object)
Specify the `dtype` to control how datetime-aware data is represented.
Use ``dtype=object`` to return an ndarray of pandas :class:`Timestamp`
objects, each with the correct ``tz``.
>>> ser = pd.Series(pd.date_range('2000', periods=2, tz="CET"))
>>> ser.to_numpy(dtype=object)
array([Timestamp('2000-01-01 00:00:00+0100', tz='CET'),
Timestamp('2000-01-02 00:00:00+0100', tz='CET')],
dtype=object)
Or ``dtype='datetime64[ns]'`` to return an ndarray of native
datetime64 values. The values are converted to UTC and the timezone
info is dropped.
>>> ser.to_numpy(dtype="datetime64[ns]")
... # doctest: +ELLIPSIS
array(['1999-12-31T23:00:00.000000000', '2000-01-01T23:00:00...'],
dtype='datetime64[ns]')
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Return int position of the {value} value in the Series.
If the {op}imum is achieved in multiple locations,
the first row position is returned.
Parameters
----------
axis : {{None}}
Unused. Parameter needed for compatibility with DataFrame.
skipna : bool, default True
Exclude NA/null values when showing the result.
*args, **kwargs
Additional arguments and keywords for compatibility with NumPy.
Returns
-------
int
Row position of the {op}imum value.
See Also
--------
Series.arg{op} : Return position of the {op}imum value.
Series.arg{oppose} : Return position of the {oppose}imum value.
numpy.ndarray.arg{op} : Equivalent method for numpy arrays.
Series.idxmax : Return index label of the maximum values.
Series.idxmin : Return index label of the minimum values.
Examples
--------
Consider dataset containing cereal calories
>>> s = pd.Series({{'Corn Flakes': 100.0, 'Almond Delight': 110.0,
... 'Cinnamon Toast Crunch': 120.0, 'Cocoa Puff': 110.0}})
>>> s
Corn Flakes 100.0
Almond Delight 110.0
Cinnamon Toast Crunch 120.0
Cocoa Puff 110.0
dtype: float64
>>> s.argmax()
2
>>> s.argmin()
0
The maximum cereal calories is the third element and
the minimum cereal calories is the first element,
since series is zero-indexed.
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Return a list of the values.
These are each a scalar type, which is a Python scalar
(for str, int, float) or a pandas scalar
(for Timestamp/Timedelta/Interval/Period)
Returns
-------
list
See Also
--------
numpy.ndarray.tolist : Return the array as an a.ndim-levels deep
nested list of Python scalars.
Examples
--------
For Series
>>> s = pd.Series([1, 2, 3])
>>> s.to_list()
[1, 2, 3]
For Index:
>>> idx = pd.Index([1, 2, 3])
>>> idx
Index([1, 2, 3], dtype='int64')
>>> idx.to_list()
[1, 2, 3]
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Return an iterator of the values.
These are each a scalar type, which is a Python scalar
(for str, int, float) or a pandas scalar
(for Timestamp/Timedelta/Interval/Period)
Returns
-------
iterator
Examples
--------
>>> s = pd.Series([1, 2, 3])
>>> for x in s:
... print(x)
1
2
3
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Return True if there are any NaNs.
Enables various performance speedups.
Returns
-------
bool
Examples
--------
>>> s = pd.Series([1, 2, 3, None])
>>> s
0 1.0
1 2.0
2 3.0
3 NaN
dtype: float64
>>> s.hasnans
True
)�boolr" r� rA s rC �hasnanszIndexOpsMixin.hasnans` s � �2 �D��J�N�N�$�%�%rE c � � | j }t |t � r|j ||�� S t j
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An internal function that maps values using the input
correspondence (which can be a dict, Series, or function).
Parameters
----------
mapper : function, dict, or Series
The input correspondence object
na_action : {None, 'ignore'}
If 'ignore', propagate NA values, without passing them to the
mapping function
convert : bool, default True
Try to find better dtype for elementwise function results. If
False, leave as dtype=object. Note that the dtype is always
preserved for some extension array dtypes, such as Categorical.
Returns
-------
Union[Index, MultiIndex], inferred
The output of the mapping function applied to the index.
If the function returns a tuple with more than one element
a MultiIndex will be returned.
)� na_action)r� �convert)r� ry r) r� r$ � map_array)rB �mapperr� r� �arrs rC � _map_valueszIndexOpsMixin._map_values{ sA � �2 �l�l�� �c�>� *��7�7�6�Y�7�7� 7��#�#�C��9�g�V�VrE c �8 � t j | |||||�� S )a=
Return a Series containing counts of unique values.
The resulting object will be in descending order so that the
first element is the most frequently-occurring element.
Excludes NA values by default.
Parameters
----------
normalize : bool, default False
If True then the object returned will contain the relative
frequencies of the unique values.
sort : bool, default True
Sort by frequencies when True. Preserve the order of the data when False.
ascending : bool, default False
Sort in ascending order.
bins : int, optional
Rather than count values, group them into half-open bins,
a convenience for ``pd.cut``, only works with numeric data.
dropna : bool, default True
Don't include counts of NaN.
Returns
-------
Series
See Also
--------
Series.count: Number of non-NA elements in a Series.
DataFrame.count: Number of non-NA elements in a DataFrame.
DataFrame.value_counts: Equivalent method on DataFrames.
Examples
--------
>>> index = pd.Index([3, 1, 2, 3, 4, np.nan])
>>> index.value_counts()
3.0 2
1.0 1
2.0 1
4.0 1
Name: count, dtype: int64
With `normalize` set to `True`, returns the relative frequency by
dividing all values by the sum of values.
>>> s = pd.Series([3, 1, 2, 3, 4, np.nan])
>>> s.value_counts(normalize=True)
3.0 0.4
1.0 0.2
2.0 0.2
4.0 0.2
Name: proportion, dtype: float64
**bins**
Bins can be useful for going from a continuous variable to a
categorical variable; instead of counting unique
apparitions of values, divide the index in the specified
number of half-open bins.
>>> s.value_counts(bins=3)
(0.996, 2.0] 2
(2.0, 3.0] 2
(3.0, 4.0] 1
Name: count, dtype: int64
**dropna**
With `dropna` set to `False` we can also see NaN index values.
>>> s.value_counts(dropna=False)
3.0 2
1.0 1
2.0 1
4.0 1
NaN 1
Name: count, dtype: int64
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Return number of unique elements in the object.
Excludes NA values by default.
Parameters
----------
dropna : bool, default True
Don't include NaN in the count.
Returns
-------
int
See Also
--------
DataFrame.nunique: Method nunique for DataFrame.
Series.count: Count non-NA/null observations in the Series.
Examples
--------
>>> s = pd.Series([1, 3, 5, 7, 7])
>>> s
0 1
1 3
2 5
3 7
4 7
dtype: int64
>>> s.nunique()
4
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Return boolean if values in the object are unique.
Returns
-------
bool
Examples
--------
>>> s = pd.Series([1, 2, 3])
>>> s.is_unique
True
>>> s = pd.Series([1, 2, 3, 1])
>>> s.is_unique
False
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Return boolean if values in the object are monotonically increasing.
Returns
-------
bool
Examples
--------
>>> s = pd.Series([1, 2, 2])
>>> s.is_monotonic_increasing
True
>>> s = pd.Series([3, 2, 1])
>>> s.is_monotonic_increasing
False
r �r3 )�pandasr3 �is_monotonic_increasing�rB r3 s rC r z%IndexOpsMixin.is_monotonic_increasingA � � �& !��T�{�2�2�2rE c �2 � ddl m} || � j S )a\
Return boolean if values in the object are monotonically decreasing.
Returns
-------
bool
Examples
--------
>>> s = pd.Series([3, 2, 2, 1])
>>> s.is_monotonic_decreasing
True
>>> s = pd.Series([1, 2, 3])
>>> s.is_monotonic_decreasing
False
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Memory usage of the values.
Parameters
----------
deep : bool, default False
Introspect the data deeply, interrogate
`object` dtypes for system-level memory consumption.
Returns
-------
bytes used
See Also
--------
numpy.ndarray.nbytes : Total bytes consumed by the elements of the
array.
Notes
-----
Memory usage does not include memory consumed by elements that
are not components of the array if deep=False or if used on PyPy
Examples
--------
>>> idx = pd.Index([1, 2, 3])
>>> idx.memory_usage()
24
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Find indices where elements should be inserted to maintain order.
Find the indices into a sorted {klass} `self` such that, if the
corresponding elements in `value` were inserted before the indices,
the order of `self` would be preserved.
.. note::
The {klass} *must* be monotonically sorted, otherwise
wrong locations will likely be returned. Pandas does *not*
check this for you.
Parameters
----------
value : array-like or scalar
Values to insert into `self`.
side : {{'left', 'right'}}, optional
If 'left', the index of the first suitable location found is given.
If 'right', return the last such index. If there is no suitable
index, return either 0 or N (where N is the length of `self`).
sorter : 1-D array-like, optional
Optional array of integer indices that sort `self` into ascending
order. They are typically the result of ``np.argsort``.
Returns
-------
int or array of int
A scalar or array of insertion points with the
same shape as `value`.
See Also
--------
sort_values : Sort by the values along either axis.
numpy.searchsorted : Similar method from NumPy.
Notes
-----
Binary search is used to find the required insertion points.
Examples
--------
>>> ser = pd.Series([1, 2, 3])
>>> ser
0 1
1 2
2 3
dtype: int64
>>> ser.searchsorted(4)
3
>>> ser.searchsorted([0, 4])
array([0, 3])
>>> ser.searchsorted([1, 3], side='left')
array([0, 2])
>>> ser.searchsorted([1, 3], side='right')
array([1, 3])
>>> ser = pd.Series(pd.to_datetime(['3/11/2000', '3/12/2000', '3/13/2000']))
>>> ser
0 2000-03-11
1 2000-03-12
2 2000-03-13
dtype: datetime64[ns]
>>> ser.searchsorted('3/14/2000')
3
>>> ser = pd.Categorical(
... ['apple', 'bread', 'bread', 'cheese', 'milk'], ordered=True
... )
>>> ser
['apple', 'bread', 'bread', 'cheese', 'milk']
Categories (4, object): ['apple' < 'bread' < 'cheese' < 'milk']
>>> ser.searchsorted('bread')
1
>>> ser.searchsorted(['bread'], side='right')
array([3])
If the values are not monotonically sorted, wrong locations
may be returned:
>>> ser = pd.Series([2, 1, 3])
>>> ser
0 2
1 1
2 3
dtype: int64
>>> ser.searchsorted(1) # doctest: +SKIP
0 # wrong result, correct would be 1
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