Continuous colour map in python with matplotlib. Requires matplotlib 1.5?

Colormap.py

#http://matplotlib.org/examples/color/colormaps_reference.html
#http://matplotlib.org/users/colormaps.html

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

N = 200
x = np.random.randn(N)
y = np.random.randn(N)
colour = np.random.randn(N)

fig,ax=plt.subplots(2,2,figsize=(21,14))
ax[0,0].scatter(x, y, c=colour, cmap=cm.plasma,linewidth=0,s=100)
ax[0,0].set_axis_bgcolor('lightgrey')
ax[0,1].scatter(x, y, c=colour, cmap=cm.cool,linewidth=0,s=100)
ax[0,1].set_axis_bgcolor('lightgrey')
ax[1,0].scatter(x, y, c=colour, cmap=cm.coolwarm,linewidth=0,s=100)
ax[1,0].set_axis_bgcolor('white')
ax[1,1].scatter(x, y, c=colour, cmap=cm.Paired,linewidth=0,s=100)
ax[1,1].set_axis_bgcolor('lightgrey')

plt.show()

plt.scatter(x, y, c=colour, cmap=cm.plasma,linewidth=0,s=100)
plt.colorbar()

plt.show()