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Create data for iteration given `by` is assigned or not, and it is only
used in both hist and boxplot.
If `by` is assigned, return a dictionary of DataFrames in which the key of
dictionary is the values in groups.
If `by` is not assigned, return input as is, and this preserves current
status of iter_data.
Parameters
----------
data : reformatted grouped data from `_compute_plot_data` method.
kind : str, plot kind. This function is only used for `hist` and `box` plots.
Returns
-------
iter_data : DataFrame or Dictionary of DataFrames
Examples
--------
If `by` is assigned:
>>> import numpy as np
>>> tuples = [('h1', 'a'), ('h1', 'b'), ('h2', 'a'), ('h2', 'b')]
>>> mi = pd.MultiIndex.from_tuples(tuples)
>>> value = [[1, 3, np.nan, np.nan],
... [3, 4, np.nan, np.nan], [np.nan, np.nan, 5, 6]]
>>> data = pd.DataFrame(value, columns=mi)
>>> create_iter_data_given_by(data)
{'h1': h1
a b
0 1.0 3.0
1 3.0 4.0
2 NaN NaN, 'h2': h2
a b
0 NaN NaN
1 NaN NaN
2 5.0 6.0}
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isinstance�columnsr �levels�loc�get_level_values)�data�kind�level�cols �EC:\Python312\Lib\site-packages\pandas/plotting/_matplotlib/groupby.py�create_iter_data_given_byr s� � �^ �v�~����� �d�l�l�J� /�/� /� �<�<�&�&�u�-� � � �T�X�X�a�� � �6�6�u�=��D�D�
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Internal function to group data, and reassign multiindex column names onto the
result in order to let grouped data be used in _compute_plot_data method.
Parameters
----------
data : Original DataFrame to plot
by : grouped `by` parameter selected by users
cols : columns of data set (excluding columns used in `by`)
Returns
-------
Output is the reconstructed DataFrame with MultiIndex columns. The first level
of MI is unique values of groups, and second level of MI is the columns
selected by users.
Examples
--------
>>> d = {'h': ['h1', 'h1', 'h2'], 'a': [1, 3, 5], 'b': [3, 4, 6]}
>>> df = pd.DataFrame(d)
>>> reconstruct_data_with_by(df, by='h', cols=['a', 'b'])
h1 h2
a b a b
0 1.0 3.0 NaN NaN
1 3.0 4.0 NaN NaN
2 NaN NaN 5.0 6.0
r )�axis)r �groupbyr � from_productr �appendr )
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r �reconstruct_data_with_byr( X s~ � �< )��,�K��l�l�;�'�G��I� � $�
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}t |� �� c}� j S t | � S c c}w )z�Internal function to reformat y given `by` is applied or not for hist plot.
If by is None, input y is 1-d with NaN removed; and if by is not None, groupby
will take place and input y is multi-dimensional array.
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