Hi Paul,
I've modified your suggestion a little, since I don't want a grid for the
primary axis at all -- unfortunately to no avail, i.e. no grid line at all:
import numpy
import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt
datax = numpy.arange(50)
data1 = numpy.sin(datax)*1.5
data2 = datax**2
plt.close('all')
fig = plt.figure()
ax1 = fig.add_subplot(111)
ax2 = ax1.twinx()
ax1.plot(datax, data1, 'x')
ax2.plot(datax, data2, '--')
#for ax in [ax1, ax2]:
# ax.xaxis.grid(True, which='both') # `which` can be 'minor', 'major', or
'both'
# ax.yaxis.grid(True, which='both')
ax2.xaxis.grid(True, which='both')
ax2.yaxis.grid(True, which='both')
fig.savefig('twinxgrid.png')
#fig.show()
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