Bubble Chart Title and Colors

Question

In the following bubble chart, how can I:

1. Randomize the color of each bubble

2. Adjust the title (maybe upper) so it will not overlap with the graph tag on the far up left corner.

Here is my output:

Here is my code:

import matplotlib.pyplot as plt
N=5
province=['Ontario','Quebec','BritishColumbia','Manitoba','NovaScoti']
size = [908.607,1356.547,922.509,552.329,651.036]
population = [12851821,7903001,4400057,1208268,4160000]
injuries = [625,752,629,1255,630]
plt.scatter(size,population,s=injuries)
for i in range(N):
    plt.annotate(province[i],xy=(size[i],population[i]))
plt.xlabel('Size(*1000km2)')
plt.ylabel('Population(ten million)')
plt.title('The Car Accidents Injuries Rate in 5 Canada Provinces')
plt.show

Answer 1

1. You can feed an array of N random numbers to a colormap to get N random colors, and then use that as the color argument when you call plt.scatter. color can be a list of colors the same length as the size and population lists, which will color each scatter point separately.

2. plt.title takes the argument y which will adjust the vertical placement of the title. In your case, try setting it to 1.05.

Here's your script, modified:

import matplotlib.pyplot as plt
import matplotlib.cm as cm
import numpy as np

N=5
province=['Ontario','Quebec','BritishColumbia','Manitoba','NovaScoti']
size = [908.607,1356.547,922.509,552.329,651.036]
population = [12851821,7903001,4400057,1208268,4160000]
injuries = [625,752,629,1255,630]

# Choose some random colors
colors=cm.rainbow(np.random.rand(N))

# Use those colors as the color argument
plt.scatter(size,population,s=injuries,color=colors)
for i in range(N):
    plt.annotate(province[i],xy=(size[i],population[i]))
plt.xlabel('Size(*1000km2)')
plt.ylabel('Population(ten million)')

# Move title up with the "y" option
plt.title('The Car Accidents Injuries Rate in 5 Canada Provinces',y=1.05)
plt.show()