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The legend module defines the Legend class, which is responsible for
drawing legends associated with Axes and/or figures.

.. important::

    It is unlikely that you would ever create a Legend instance manually.
    Most users would normally create a legend via the `~.Axes.legend`
    function. For more details on legends there is also a :ref:`legend guide
    <legend_guide>`.

The `Legend` class is a container of legend handles and legend texts.

The legend handler map specifies how to create legend handles from artists
(lines, patches, etc.) in the Axes or figures. Default legend handlers are
defined in the :mod:`~matplotlib.legend_handler` module. While not all artist
types are covered by the default legend handlers, custom legend handlers can be
defined to support arbitrary objects.

See the :ref`<legend_guide>` for more
information.
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        Wrapper around a `.Legend` to support mouse dragging.

        Parameters
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        legend : `.Legend`
            The `.Legend` instance to wrap.
        use_blit : bool, optional
            Use blitting for faster image composition. For details see
            :ref:`func-animation`.
        update : {'loc', 'bbox'}, optional
            If "loc", update the *loc* parameter of the legend upon finalizing.
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bbox_to_anchor : `.BboxBase`, 2-tuple, or 4-tuple of floats
    Box that is used to position the legend in conjunction with *loc*.
    Defaults to `axes.bbox` (if called as a method to `.Axes.legend`) or
    `figure.bbox` (if `.Figure.legend`).  This argument allows arbitrary
    placement of the legend.

    Bbox coordinates are interpreted in the coordinate system given by
    *bbox_transform*, with the default transform
    Axes or Figure coordinates, depending on which ``legend`` is called.

    If a 4-tuple or `.BboxBase` is given, then it specifies the bbox
    ``(x, y, width, height)`` that the legend is placed in.
    To put the legend in the best location in the bottom right
    quadrant of the Axes (or figure)::

        loc='best', bbox_to_anchor=(0.5, 0., 0.5, 0.5)

    A 2-tuple ``(x, y)`` places the corner of the legend specified by *loc* at
    x, y.  For example, to put the legend's upper right-hand corner in the
    center of the Axes (or figure) the following keywords can be used::

        loc='upper right', bbox_to_anchor=(0.5, 0.5)

ncols : int, default: 1
    The number of columns that the legend has.

    For backward compatibility, the spelling *ncol* is also supported
    but it is discouraged. If both are given, *ncols* takes precedence.

prop : None or `~matplotlib.font_manager.FontProperties` or dict
    The font properties of the legend. If None (default), the current
    :data:`matplotlib.rcParams` will be used.

fontsize : int or {'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'}
    The font size of the legend. If the value is numeric the size will be the
    absolute font size in points. String values are relative to the current
    default font size. This argument is only used if *prop* is not specified.

labelcolor : str or list, default: :rc:`legend.labelcolor`
    The color of the text in the legend. Either a valid color string
    (for example, 'red'), or a list of color strings. The labelcolor can
    also be made to match the color of the line or marker using 'linecolor',
    'markerfacecolor' (or 'mfc'), or 'markeredgecolor' (or 'mec').

    Labelcolor can be set globally using :rc:`legend.labelcolor`. If None,
    use :rc:`text.color`.

numpoints : int, default: :rc:`legend.numpoints`
    The number of marker points in the legend when creating a legend
    entry for a `.Line2D` (line).

scatterpoints : int, default: :rc:`legend.scatterpoints`
    The number of marker points in the legend when creating
    a legend entry for a `.PathCollection` (scatter plot).

scatteryoffsets : iterable of floats, default: ``[0.375, 0.5, 0.3125]``
    The vertical offset (relative to the font size) for the markers
    created for a scatter plot legend entry. 0.0 is at the base the
    legend text, and 1.0 is at the top. To draw all markers at the
    same height, set to ``[0.5]``.

markerscale : float, default: :rc:`legend.markerscale`
    The relative size of legend markers compared to the originally drawn ones.

markerfirst : bool, default: True
    If *True*, legend marker is placed to the left of the legend label.
    If *False*, legend marker is placed to the right of the legend label.

reverse : bool, default: False
    If *True*, the legend labels are displayed in reverse order from the input.
    If *False*, the legend labels are displayed in the same order as the input.

    .. versionadded:: 3.7

frameon : bool, default: :rc:`legend.frameon`
    Whether the legend should be drawn on a patch (frame).

fancybox : bool, default: :rc:`legend.fancybox`
    Whether round edges should be enabled around the `.FancyBboxPatch` which
    makes up the legend's background.

shadow : None, bool or dict, default: :rc:`legend.shadow`
    Whether to draw a shadow behind the legend.
    The shadow can be configured using `.Patch` keywords.
    Customization via :rc:`legend.shadow` is currently not supported.

framealpha : float, default: :rc:`legend.framealpha`
    The alpha transparency of the legend's background.
    If *shadow* is activated and *framealpha* is ``None``, the default value is
    ignored.

facecolor : "inherit" or color, default: :rc:`legend.facecolor`
    The legend's background color.
    If ``"inherit"``, use :rc:`axes.facecolor`.

edgecolor : "inherit" or color, default: :rc:`legend.edgecolor`
    The legend's background patch edge color.
    If ``"inherit"``, use :rc:`axes.edgecolor`.

mode : {"expand", None}
    If *mode* is set to ``"expand"`` the legend will be horizontally
    expanded to fill the Axes area (or *bbox_to_anchor* if defines
    the legend's size).

bbox_transform : None or `~matplotlib.transforms.Transform`
    The transform for the bounding box (*bbox_to_anchor*). For a value
    of ``None`` (default) the Axes'
    :data:`~matplotlib.axes.Axes.transAxes` transform will be used.

title : str or None
    The legend's title. Default is no title (``None``).

title_fontproperties : None or `~matplotlib.font_manager.FontProperties` or dict
    The font properties of the legend's title. If None (default), the
    *title_fontsize* argument will be used if present; if *title_fontsize* is
    also None, the current :rc:`legend.title_fontsize` will be used.

title_fontsize : int or {'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'}, default: :rc:`legend.title_fontsize`
    The font size of the legend's title.
    Note: This cannot be combined with *title_fontproperties*. If you want
    to set the fontsize alongside other font properties, use the *size*
    parameter in *title_fontproperties*.

alignment : {'center', 'left', 'right'}, default: 'center'
    The alignment of the legend title and the box of entries. The entries
    are aligned as a single block, so that markers always lined up.

borderpad : float, default: :rc:`legend.borderpad`
    The fractional whitespace inside the legend border, in font-size units.

labelspacing : float, default: :rc:`legend.labelspacing`
    The vertical space between the legend entries, in font-size units.

handlelength : float, default: :rc:`legend.handlelength`
    The length of the legend handles, in font-size units.

handleheight : float, default: :rc:`legend.handleheight`
    The height of the legend handles, in font-size units.

handletextpad : float, default: :rc:`legend.handletextpad`
    The pad between the legend handle and text, in font-size units.

borderaxespad : float, default: :rc:`legend.borderaxespad`
    The pad between the Axes and legend border, in font-size units.

columnspacing : float, default: :rc:`legend.columnspacing`
    The spacing between columns, in font-size units.

handler_map : dict or None
    The custom dictionary mapping instances or types to a legend
    handler. This *handler_map* updates the default handler map
    found at `matplotlib.legend.Legend.get_legend_handler_map`.

draggable : bool, default: False
    Whether the legend can be dragged with the mouse.
a4
loc : str or pair of floats, default: {default}
    The location of the legend.

    The strings ``'upper left'``, ``'upper right'``, ``'lower left'``,
    ``'lower right'`` place the legend at the corresponding corner of the
    {parent}.

    The strings ``'upper center'``, ``'lower center'``, ``'center left'``,
    ``'center right'`` place the legend at the center of the corresponding edge
    of the {parent}.

    The string ``'center'`` places the legend at the center of the {parent}.
{best}
    The location can also be a 2-tuple giving the coordinates of the lower-left
    corner of the legend in {parent} coordinates (in which case *bbox_to_anchor*
    will be ignored).

    For back-compatibility, ``'center right'`` (but no other location) can also
    be spelled ``'right'``, and each "string" location can also be given as a
    numeric value:

    ==================   =============
    Location String      Location Code
    ==================   =============
    'best' (Axes only)   0
    'upper right'        1
    'upper left'         2
    'lower left'         3
    'lower right'        4
    'right'              5
    'center left'        6
    'center right'       7
    'lower center'       8
    'upper center'       9
    'center'             10
    ==================   =============
    {outside}a/
    The string ``'best'`` places the legend at the location, among the nine
    locations defined so far, with the minimum overlap with other drawn
    artists.  This option can be quite slow for plots with large amounts of
    data; your plotting speed may benefit from providing a specific location.
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    upper right' will make space for the legend above the rest of the
    axes in the layout, and 'outside right upper' will make space on the
    right side of the layout.  In addition to the values of *loc*
    listed above, we have 'outside right upper', 'outside right lower',
    'outside left upper', and 'outside left lower'.  See
    :ref:`legend_guide` for more details.
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        Parameters
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        handles : list of (`.Artist` or tuple of `.Artist`)
            A list of Artists (lines, patches) to be added to the legend.

        labels : list of str
            A list of labels to show next to the artists. The length of handles
            and labels should be the same. If they are not, they are truncated
            to the length of the shorter list.

        Other Parameters
        ----------------
        %(_legend_kw_doc)s

        Attributes
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            List of `.Artist` objects added as legend entries.

            .. versionadded:: 3.7
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