Matplotlib 2.x By Example

Labeling data values on a bar chart

Sometimes we would prefer more exact values than guess between ticks on axes. To automatically retrieve and label data values on a bar graph, we can define our own function to put text above each bar. Essentially, the pyplot.bar() function creates a list of rectangles with assigned dimensions. What we do is collect these dimensions to determine the location of the text to be added.

We are recycling the previous non-resident arrivals figure. We can add the following code block of the value-labeling function and call it after defining ax1.bar() to add value labels above each bar:

# Prepare the bar value labelling functiondef autolabel(rects):    """    Attach a text label above each bar displaying its height Adapted ...