color-map | Color map generator | Generator Utils library

I am making hexbin plots using the following Python script:

Is there a way in Plotly to access colormap colours at any value along its range?

I know I can access the defining colours for a colourscale from

How does one update the color mapper in Bokeh between categorical, linear and logarithmic? The code below with circle.glyph.fill_color['transform'] = mapper does not work when executed with bokeh serve. I reviewed this question, but I still can't figure it out. Thanks.

I am using imshow to plot a sparse matrix and would like for 0 entries to be colored black. I followed the advice given in this answer, but my plot still has white for 0 entries, which is confusing since the highest weighted entries are hot yellow. Any help is much appreciated.

Here is my code:

I have a 2D triangle mesh with n vertices that is stored in a variable tri (a matplotlib.tri.Triangulation object); I can plot the mesh with matplotlib's tripcolor function easily enough and everything works fine. However, I also have (r,g,b) triples for each vertex (vcolors), and these values do not fall along a single dimension thus can't be easily converted to a color-map (for example, imagine if you overlaid a triangle mesh on a large photo of a park, then assigned each vertex the color of the pixel beneath it).

I thought I would be able to do something like this:

I have bi-variate time-series stored in 2D Numpy arrays. I would like to plot both channels of the series on the same plot. Each series should be represented by a line which is colored according to the channel. On top of these lines, I want to plot the points of the series as dots. These should be colored according to values in a second 2D Numpy array of the same shape. My question is: how to set a color-map for the dots in a range that is common to both channels?

I managed to get lines of different colors and dots for each series with a double call of plt.plot() and plt.scatter() with something like:

I want to output some utility classes and I can't seem to get the lighter and darker tones of my base color to output both darker and lighter tones. I am new to Scss but this is what I have:

I have been reading a lot of similar posts like here, here, here, and so on, yet I am not able to fix my problem. I need the colormap for my scatter plot to be effective on both axes, yet it can work on one axis only (in my example, axis "x"):

I am trying to plot vertical lines with different colors from continuous colormap 'jet' and noticed that function plt.contourf() is not capable of plotting over 9 colors.

Here is an example about the situation where number of colors can be controlled by changing the value of the variable num_colors. I used specific values for this example because I noticed this phenomenon in another program which uses same values for Z.