Partially transparent scatter plot, but with a solid color bar

Question

In Python, with Matplotlib, how to simply do a scatter plot with transparency (alpha < 1), but with a color bar that represents their color value, but has alpha = 1?

Answer 1

This is a huge, ugly hack. But no other way would work. Maybe someone else can improve.

fig1 = pylab.figure()
fig2 = pylab.figure()
ax1 = fig1.add_subplot(111)
ax2 = fig2.add_subplot(111)
ax1.scatter(range(10), range(10), c=range(10), alpha=0.2)
im = ax2.scatter(range(10), range(10), c=range(10), alpha=1.0)
fig1.colorbar(im, ax=ax1)
fig1.show()