Transparent colors

Plot data using transparent (alpha) value t

import matplotlib.pyplot as plt

import numpy

# generate dataset of 100 samples

x=numpy.random.uniform(-5,5,size=100)

y=numpy.random.uniform(-5,5,size=100)

# generate 100 random transparent values

# range between 0 (fully transparent) and 1 (no transparency)

t=numpy.random.rand(100)

# create color settings (red, green, blue, alpha) for each data point, using t as transparent alpha value

dotcolors=[(0.2, 0.4, 0.6, a) for a in t]

# plot

plt.scatter(x, y, c=dotcolors, s=200, edgecolors='None')

plt.show()