matplotlib.legend 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 legend function. For more details on legends there is also a 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 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 legend guide for more information.   classmatplotlib.legend.DraggableLegend(legend, use_blit=False, update='loc')[source]
 
Bases: matplotlib.offsetbox.DraggableOffsetBox Wrapper around a Legend to support mouse dragging.  Parameters 
 
legendLegend


The Legend instance to wrap.  
use_blitbool, optional


Use blitting for faster image composition. For details see FuncAnimation.  
update{'loc', 'bbox'}, optional


If "loc", update the loc parameter of the legend upon finalizing. If "bbox", update the bbox_to_anchor parameter.       finalize_offset()[source]

 
   classmatplotlib.legend.Legend(parent, handles, labels, loc=None, numpoints=None, markerscale=None, markerfirst=True, scatterpoints=None, scatteryoffsets=None, prop=None, fontsize=None, labelcolor=None, borderpad=None, labelspacing=None, handlelength=None, handleheight=None, handletextpad=None, borderaxespad=None, columnspacing=None, ncol=1, mode=None, fancybox=None, shadow=None, title=None, title_fontsize=None, framealpha=None, edgecolor=None, facecolor=None, bbox_to_anchor=None, bbox_transform=None, frameon=None, handler_map=None, title_fontproperties=None)[source]
 
Bases: matplotlib.artist.Artist Place a legend on the axes at location loc.  Parameters 
 
parentAxes or Figure


The artist that contains the legend.  
handleslist of Artist


A list of Artists (lines, patches) to be added to the legend.  
labelslist 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 smaller of both lengths.    Other Parameters 
 
locstr or pair of floats, default: rcParams["legend.loc"] (default: 'best') ('best' for axes, 'upper right' for figures)


The location of the legend. The strings 'upper left', 'upper right', 'lower left', 'lower right' place the legend at the corresponding corner of the axes/figure. The strings 'upper center', 'lower center', 'center left', 'center right' place the legend at the center of the corresponding edge of the axes/figure. The string 'center' places the legend at the center of the axes/figure. 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. The location can also be a 2-tuple giving the coordinates of the lower-left corner of the legend in axes 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" locations can also be given as a numeric value:   
Location String Location Code   
'best' 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    
bbox_to_anchorBboxBase, 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)
  
ncolint, default: 1


The number of columns that the legend has.  
propNone or matplotlib.font_manager.FontProperties or dict


The font properties of the legend. If None (default), the current matplotlib.rcParams will be used.  
fontsizeint 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.  
labelcolorstr or list, default: rcParams["legend.labelcolor"] (default: 'None')


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 rcParams["legend.labelcolor"] (default: 'None'). If None, use rcParams["text.color"] (default: 'black').  
numpointsint, default: rcParams["legend.numpoints"] (default: 1)


The number of marker points in the legend when creating a legend entry for a Line2D (line).  
scatterpointsint, default: rcParams["legend.scatterpoints"] (default: 1)


The number of marker points in the legend when creating a legend entry for a PathCollection (scatter plot).  
scatteryoffsetsiterable 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].  
markerscalefloat, default: rcParams["legend.markerscale"] (default: 1.0)


The relative size of legend markers compared with the originally drawn ones.  
markerfirstbool, 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.  
frameonbool, default: rcParams["legend.frameon"] (default: True)


Whether the legend should be drawn on a patch (frame).  
fancyboxbool, default: rcParams["legend.fancybox"] (default: True)


Whether round edges should be enabled around the FancyBboxPatch which makes up the legend's background.  
shadowbool, default: rcParams["legend.shadow"] (default: False)


Whether to draw a shadow behind the legend.  
framealphafloat, default: rcParams["legend.framealpha"] (default: 0.8)


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: rcParams["legend.facecolor"] (default: 'inherit')


The legend's background color. If "inherit", use rcParams["axes.facecolor"] (default: 'white').  
edgecolor"inherit" or color, default: rcParams["legend.edgecolor"] (default: '0.8')


The legend's background patch edge color. If "inherit", use take rcParams["axes.edgecolor"] (default: 'black').  
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_transformNone or matplotlib.transforms.Transform


The transform for the bounding box (bbox_to_anchor). For a value of None (default) the Axes' transAxes transform will be used.  
titlestr or None


The legend's title. Default is no title (None).  
title_fontpropertiesNone 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 rcParams["legend.title_fontsize"] (default: None) will be used.  
title_fontsizeint or {'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', 'xx-large'}, default: rcParams["legend.title_fontsize"] (default: None)


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.  
borderpadfloat, default: rcParams["legend.borderpad"] (default: 0.4)


The fractional whitespace inside the legend border, in font-size units.  
labelspacingfloat, default: rcParams["legend.labelspacing"] (default: 0.5)


The vertical space between the legend entries, in font-size units.  
handlelengthfloat, default: rcParams["legend.handlelength"] (default: 2.0)


The length of the legend handles, in font-size units.  
handleheightfloat, default: rcParams["legend.handleheight"] (default: 0.7)


The height of the legend handles, in font-size units.  
handletextpadfloat, default: rcParams["legend.handletextpad"] (default: 0.8)


The pad between the legend handle and text, in font-size units.  
borderaxespadfloat, default: rcParams["legend.borderaxespad"] (default: 0.5)


The pad between the axes and legend border, in font-size units.  
columnspacingfloat, default: rcParams["legend.columnspacing"] (default: 2.0)


The spacing between columns, in font-size units.  
handler_mapdict 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.     Notes Users can specify any arbitrary location for the legend using the bbox_to_anchor keyword argument. bbox_to_anchor can be a BboxBase (or derived there from) or a tuple of 2 or 4 floats. See set_bbox_to_anchor for more detail. The legend location can be specified by setting loc with a tuple of 2 floats, which is interpreted as the lower-left corner of the legend in the normalized axes coordinate.   codes={'best': 0, 'center': 10, 'center left': 6, 'center right': 7, 'lower center': 8, 'lower left': 3, 'lower right': 4, 'right': 5, 'upper center': 9, 'upper left': 2, 'upper right': 1}

   contains(event)[source]
 
Test whether the artist contains the mouse event.  Parameters 
 
mouseeventmatplotlib.backend_bases.MouseEvent

  Returns 
 
containsbool


Whether any values are within the radius.  
detailsdict


An artist-specific dictionary of details of the event context, such as which points are contained in the pick radius. See the individual Artist subclasses for details.     
   draw(renderer)[source]
 
Draw the Artist (and its children) using the given renderer. This has no effect if the artist is not visible (Artist.get_visible returns False).  Parameters 
 
rendererRendererBase subclass.

   Notes This method is overridden in the Artist subclasses. 
   draw_frame(b)[source]
 
Set whether the legend box patch is drawn.  Parameters 
 
bbool

   
   get_bbox_to_anchor()[source]
 
Return the bbox that the legend will be anchored to. 
   get_children()[source]
 
Return a list of the child Artists of this Artist. 
   classmethodget_default_handler_map()[source]
 
A class method that returns the default handler map. 
   get_draggable()[source]
 
Return True if the legend is draggable, False otherwise. 
   get_frame()[source]
 
Return the Rectangle used to frame the legend. 
   get_frame_on()[source]
 
Get whether the legend box patch is drawn. 
   staticget_legend_handler(legend_handler_map, orig_handle)[source]
 
Return a legend handler from legend_handler_map that corresponds to orig_handler. legend_handler_map should be a dictionary object (that is returned by the get_legend_handler_map method). It first checks if the orig_handle itself is a key in the legend_handler_map and return the associated value. Otherwise, it checks for each of the classes in its method-resolution-order. If no matching key is found, it returns None. 
   get_legend_handler_map()[source]
 
Return the handler map. 
   get_lines()[source]
 
Return the list of Line2Ds in the legend. 
   get_patches()[source]
 
Return the list of Patchs in the legend. 
   get_texts()[source]
 
Return the list of Texts in the legend. 
   get_tightbbox(renderer)[source]
 
Like Artist.get_window_extent, but includes any clipping.  Parameters 
 
rendererRendererBase subclass


renderer that will be used to draw the figures (i.e. fig.canvas.get_renderer())    Returns 
 Bbox

The enclosing bounding box (in figure pixel coordinates).     
   get_title()[source]
 
Return the Text instance for the legend title. 
   get_window_extent(renderer=None)[source]
 
Get the artist's bounding box in display space. The bounding box' width and height are nonnegative. Subclasses should override for inclusion in the bounding box "tight" calculation. Default is to return an empty bounding box at 0, 0. Be careful when using this function, the results will not update if the artist window extent of the artist changes. The extent can change due to any changes in the transform stack, such as changing the axes limits, the figure size, or the canvas used (as is done when saving a figure). This can lead to unexpected behavior where interactive figures will look fine on the screen, but will save incorrectly. 
   set(*, agg_filter=<UNSET>, alpha=<UNSET>, animated=<UNSET>, bbox_to_anchor=<UNSET>, clip_box=<UNSET>, clip_on=<UNSET>, clip_path=<UNSET>, draggable=<UNSET>, frame_on=<UNSET>, gid=<UNSET>, in_layout=<UNSET>, label=<UNSET>, path_effects=<UNSET>, picker=<UNSET>, rasterized=<UNSET>, sketch_params=<UNSET>, snap=<UNSET>, title=<UNSET>, transform=<UNSET>, url=<UNSET>, visible=<UNSET>, zorder=<UNSET>)[source]
 
Set multiple properties at once. Supported properties are   
Property Description   
agg_filter a filter function, which takes a (m, n, 3) float array and a dpi value, and returns a (m, n, 3) array  
alpha scalar or None  
animated bool  
bbox_to_anchor BboxBase or tuple  
clip_box Bbox  
clip_on bool  
clip_path Patch or (Path, Transform) or None  
draggable bool  
figure Figure  
frame_on bool  
gid str  
in_layout bool  
label object  
path_effects AbstractPathEffect  
picker None or bool or float or callable  
rasterized bool  
sketch_params (scale: float, length: float, randomness: float)  
snap bool or None  
title unknown  
transform Transform  
url str  
visible bool  
zorder float   
   set_bbox_to_anchor(bbox, transform=None)[source]
 
Set the bbox that the legend will be anchored to.  Parameters 
 
bboxBboxBase or tuple


The bounding box can be specified in the following ways:  A BboxBase instance A tuple of (left, bottom, width, height) in the given transform (normalized axes coordinate if None) A tuple of (left, bottom) where the width and height will be assumed to be zero. 
None, to remove the bbox anchoring, and use the parent bbox.   
transformTransform, optional


A transform to apply to the bounding box. If not specified, this will use a transform to the bounding box of the parent.     
   classmethodset_default_handler_map(handler_map)[source]
 
A class method to set the default handler map. 
   set_draggable(state, use_blit=False, update='loc')[source]
 
Enable or disable mouse dragging support of the legend.  Parameters 
 
statebool


Whether mouse dragging is enabled.  
use_blitbool, optional


Use blitting for faster image composition. For details see FuncAnimation.  
update{'loc', 'bbox'}, optional


The legend parameter to be changed when dragged:  'loc': update the loc parameter of the legend 'bbox': update the bbox_to_anchor parameter of the legend     Returns 
 
DraggableLegend or None


If state is True this returns the DraggableLegend helper instance. Otherwise this returns None.     
   set_frame_on(b)[source]
 
Set whether the legend box patch is drawn.  Parameters 
 
bbool

   
   set_title(title, prop=None)[source]
 
Set the legend title. Fontproperties can be optionally set with prop parameter. 
   classmethodupdate_default_handler_map(handler_map)[source]
 
A class method to update the default handler map. 
   zorder=5