matplotlib.pyplot.bar

matplotlib.pyplot.bar(x, height, width=0.8, bottom=None, *, align='center', data=None, **kwargs)[source]

Make a bar plot.

The bars are positioned at x with the given alignment. Their dimensions are given by height and width. The vertical baseline is bottom (default 0).

Many parameters can take either a single value applying to all bars or a sequence of values, one for each bar.

Parameters:
xfloat or array-like

The x coordinates of the bars. See also align for the alignment of the bars to the coordinates.

heightfloat or array-like

The height(s) of the bars.

widthfloat or array-like, default: 0.8

The width(s) of the bars.

bottomfloat or array-like, default: 0

The y coordinate(s) of the bars bases.

align{'center', 'edge'}, default: 'center'

Alignment of the bars to the x coordinates:

  • 'center': Center the base on the x positions.
  • 'edge': Align the left edges of the bars with the x positions.

To align the bars on the right edge pass a negative width and align='edge'.
Returns:
BarContainer

Container with all the bars and optionally errorbars.
Other Parameters:
colorcolor or list of color, optional

The colors of the bar faces.

edgecolorcolor or list of color, optional

The colors of the bar edges.

linewidthfloat or array-like, optional

Width of the bar edge(s). If 0, don't draw edges.

tick_labelstr or list of str, optional

The tick labels of the bars. Default: None (Use default numeric labels.)

xerr, yerrfloat or array-like of shape(N,) or shape(2, N), optional

If not None, add horizontal / vertical errorbars to the bar tips. The values are +/- sizes relative to the data:

  • scalar: symmetric +/- values for all bars
  • shape(N,): symmetric +/- values for each bar
  • shape(2, N): Separate - and + values for each bar. First row contains the lower errors, the second row contains the upper errors.
  • None: No errorbar. (Default)

See Different ways of specifying error bars for an example on the usage of xerr and yerr.

ecolorcolor or list of color, default: 'black'

The line color of the errorbars.

capsizefloat, default: rcParams["errorbar.capsize"] (default: 0.0)

The length of the error bar caps in points.

error_kwdict, optional

Dictionary of kwargs to be passed to the errorbar method. Values of ecolor or capsize defined here take precedence over the independent kwargs.

logbool, default: False

If True, set the y-axis to be log scale.

**kwargsRectangle properties
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 float or None
animated bool
antialiased or aa unknown
capstyle {'butt', 'round', 'projecting'}
clip_box Bbox
clip_on bool
clip_path Patch or (Path, Transform) or None
color color
contains unknown
edgecolor or ec color or None or 'auto'
facecolor or fc color or None
figure Figure
fill bool
gid str
hatch {'/', '\', '|', '-', '+', 'x', 'o', 'O', '.', '*'}
in_layout bool
joinstyle {'miter', 'round', 'bevel'}
label object
linestyle or ls {'-', '--', '-.', ':', '', (offset, on-off-seq), ...}
linewidth or lw float or None
path_effects AbstractPathEffect
picker None or bool or callable
rasterized bool or None
sketch_params (scale: float, length: float, randomness: float)
snap bool or None
transform Transform
url str
visible bool
zorder float

See also

barh
Plot a horizontal bar plot.

Notes

Stacked bars can be achieved by passing individual bottom values per bar. See Stacked bar chart.

Note

In addition to the above described arguments, this function can take a data keyword argument. If such a data argument is given, every other argument can also be string s, which is interpreted as data[s] (unless this raises an exception).

Objects passed as data must support item access (data[s]) and membership test (s in data).