In [54]: plt.cm.jet(0)
Out[54]: (0.0, 0.0, 0.5, 1.0)

In [55]: plt.cm.Blues(127)
Out[55]: (0.42274510311145408, 0.68407537446302524, 0.83989235863966105, 1.0)

In [56]: plt.cm.gist_earth(255)
Out[56]: (0.99219999999999997, 0.98429999999999995, 0.98429999999999995, 1.0)