[Matplotlib-users] Turning grid on

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I am having an issue with the grid not appearing that I cannot figure out.
Can anyone help? Thanks. --StephenB

from matplotlib.backends.backend_pdf import PdfPages
import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure()
ax = fig.add_subplot(1,1,1)

x = np.linspace(0,10,50)
y = np.sin(x)

with PdfPages('grid_test.pdf') as pdf:
    plt.clf()

    plt.clf()
    plt.plot(x,y)
    leg = plt.legend(['legend 1'])
    plt.title('Sample title')
    ax.set_ylabel('Sample ylabel')
    ax.set_xlabel('Sample xlabel')

    ax.set_xticks(np.arange(0, 10, 20))
    ax.set_xticks(np.arange(0, 10, 5), minor=True)
    ax.set_yticks(np.arange(-1,1,20))
    ax.set_yticks(np.arange(-1,1,20), minor=True)

    ax.minorticks_on

    pdf.savefig()