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matplotlib - single axis label for multi-panel plot?
import matplotlib.pyplot as plt
fig = plt.figure()
ax1 = fig.add_subplot(2,1,1)
ax1.scatter(1,1)
ax2 = fig.add_subplot(2,1,2,sharex=ax1)
ax2.scatter(1,1)

dummy = fig.add_subplot(1,1,1)
dummy.set_visible(False)
dummy.yaxis.set_label_text('y label')
dummy.yaxis.label.set_visible(True)

import matplotlib.pyplot as plt
fig = plt.figure()
ax1 = fig.add_subplot(2,1,1)
ax1.scatter(1,1)
ax2 = fig.add_subplot(2,1,2,sharex=ax1)
ax2.scatter(1,1)

ax = fig.add_axes( [0., 0., 1, 1] )
ax.set_axis_off()
ax.set_xlim(0, 1)
ax.set_ylim(0, 1)
ax.text(
    .05, 0.5, "Y Label", rotation='vertical',
    horizontalalignment='center', verticalalignment='center'
)