python绘制误差柱状图

matplotlib.pyplot.errorbar(x,
y, yerr=None,
xerr=None,
fmt=’‘,
ecolor=None, elinewidth=None,
capsize=None,
barsabove=False, lolims=False,
uplims=False,
xlolims=False,
xuplims=False,
errorevery=1,
capthick=None,
hold=None,
data=None,
**kwargs)
Plot an errorbar graph.

Plot x versus y with error deltas in yerr and xerr. Vertical errorbars are plotted if yerr is not None. Horizontal errorbars are plotted if xerr is not None.

x, y, xerr, and yerr can all be scalars, which plots a single error bar at x, y.