Incorrectly show error Module 'matplotlib.cm' has no 'coolwarm' member

[Liampor]

Steps to reproduce

run code, which include cm.coolwarm
For example

from mpl_toolkits.mplot3d import axes3d
import matplotlib.pyplot as plt
from matplotlib import cm

fig = plt.figure()
ax = fig.gca(projection='3d')
X, Y, Z = axes3d.get_test_data(0.05)
ax.plot_surface(X, Y, Z, rstride=8, cstride=8, alpha=0.3)
cset = ax.contour(X, Y, Z, zdir='z', offset=-100, cmap=cm.coolwarm)
cset = ax.contour(X, Y, Z, zdir='x', offset=-40, cmap=cm.coolwarm)
cset = ax.contour(X, Y, Z, zdir='y', offset=40, cmap=cm.coolwarm)

ax.set_xlabel('X')
ax.set_xlim(-40, 40)
ax.set_ylabel('Y')
ax.set_ylim(-40, 40)
ax.set_zlabel('Z')
ax.set_zlim(-100, 100)

plt.show()

Current behavior

show error E1101:Module 'matplotlib.cm' has no 'coolwarm' member

Expected behavior

do not show the error E1101:Module 'matplotlib.cm' has no 'coolwarm' member

pylint --version output

pylint 1.8.2

[PCManticore]

The member does not exist because matplotlib.cm does the following to adds its attributes:

# Precache the cmaps with ``lutsize = LUTSIZE``.
# Also add the reversed ones added in the section above:
for cmapname in datad:
    cmap_d[cmapname] = _generate_cmap(cmapname, LUTSIZE)

cmap_d.update(cmaps_listed)

locals().update(cmap_d)

This is not something that pylint supports out of the box, and usually we require an astroid brain plugin in order to patch these values for the offending module.
There's also another choice, which is to use --generated-members as in pylint ... --generated-members=coolwarm.