matplotlib.pyplot.minorticks_on
- 
matplotlib.pyplot.minorticks_on()[source] - 
Display minor ticks on the axes.
Displaying minor ticks may reduce performance; you may turn them off using
minorticks_off()if drawing speed is a problem. 
    © 2012–2018 Matplotlib Development Team. All rights reserved.
Licensed under the Matplotlib License Agreement.
    https://matplotlib.org/3.0.0/api/_as_gen/matplotlib.pyplot.minorticks_on.html