How to do it...

The following code block plots a bubble plot, for which we have seen a scatter plot earlier:

1. Load the Iris dataset:

iris = pd.read_csv('iris_dataset.csv', delimiter=',')

2. In the file, each class of species is defined as 0, 1, and 2, which we will map to their descriptive names:

iris['species'] = iris['species'].map({"setosa" : 0, "versicolor" : 
                        1, "virginica" : 2})

3. Draw the scatter plot:

plt.scatter(iris.petal_length, iris.petal_width, 
            s=50*iris.petal_length*iris.petal_width, 
            c=iris.species, 
            alpha=0.3)

4. Label the x and y axes:

plt.xlabel('petal length')
plt.ylabel('petal width')

5. Display the graph on the screen:

plt.show()