The plot format symbol. If fmt is 'none' (case-insensitive), only the errorbars are plotted. This is used for adding errorbars to a bar plot, for example. ecolor : mpl color, optional, default: None A ...

The name of the errorbar () function suggests that it is specifically for adding error bars to a plot. However, it's actually much more general than that, giving a very convenient way to add ...