How to view all colormaps available in matplotlib?

Here's some code that plots all available colormaps linked to their ID's

import matplotlib as mpl
import matplotlib.pyplot as plt

def plot_colorMaps(cmap):

    fig, ax = plt.subplots(figsize=(4,0.4))
    col_map = plt.get_cmap(cmap)
    mpl.colorbar.ColorbarBase(ax, cmap=col_map, orientation = 'horizontal')

    plt.show()

for cmap_id in plt.colormaps():
    print(cmap_id)
    plot_colorMaps(cmap_id)

The output looks like this

Accent

Accent_r

Blues

etc...

plt.colormaps() returns a list of all registered colormaps. From the docs:

matplotlib.pyplot.colormaps()

Matplotlib provides a number of colormaps, and others can be added using register_cmap(). This function documents the built-in colormaps, and will also return a list of all registered colormaps if called.

The list this returns includes viridis, magma, inferno and plasma for me in 1.5.0