Variable size plot symbols, variable hue plot colors in Python (MatPlotLib) ?

[Dr. Colombes]

Using MatPlotLib plot function, is there a way to get variable size
plot symbols?  For example, using symbol strings like 'o' (circle), 's'
(square), 'x' (cross), etc., is there a way to specify other plot
symbols such a small circle, Medium square, LARGE cross, etc.?

Similarly, using the MatPlotLib plot function, is there a way to get
variable hue (RGB-specified) plot colors?  For example, using symbol
strings like 'b' (blue), 'g' (green), 'red' (red), etc., is there a way
to specify other colors such as light blue, dark green, pink, etc.?

Or perhaps is there some other Python MatPlotLib or other Python module
functions that allow variable size plot symbols and variable hue plot
colors in Python ?

Thank you for your suggestions.