[Python] How can I use a pre-made color map for my heat map in matplotlib?

I want to use a color map for my matplotlib heat map.

I tried doing this:

myHeatMap.imshow(heatMap, extent=ext, cmap=get_cmap(cm.datad["Spectral"]))


However, the Python interpreter complains

in get_cmap
if name in cmap_d:
TypeError: unhashable type: 'dict'


What is the proper way to use one of these color maps?

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