Matplotlib add minor ticker

 

import matplotlib.pyplot as plt

from matplotlib.ticker import MultipleLocator, FormatStrFormatter

majorLocator = MultipleLocator(20)
majorFormatter = FormatStrFormatter('%d')
minorLocator = MultipleLocator(5)


t = np.arange(0.0, 100.0, 0.1)
s = np.sin(0.1*np.pi*t)*np.exp(-t*0.01)

fig, ax = plt.subplots()
plt.plot(t, s)

ax.xaxis.set_major_locator(majorLocator)
ax.xaxis.set_major_formatter(majorFormatter)

# for the minor ticks, use no labels; default NullFormatter
ax.xaxis.set_minor_locator(minorLocator)

plt.show()

Reference:

https://matplotlib.org/2.0.2/examples/pylab_examples/major_minor_demo1.html