Answers for "plt.plot how many ticks"

Set axis ticks matplotlib

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as ticker

x = [0,5,9,10,15]
y = [0,1,2,3,4]
fig, ax = plt.subplots()
ax.plot(x,y)
start, end = ax.get_xlim()
ax.set_xticks(np.arange(start, end, 2))
plt.show()

matplotlib limit number of ticks

plt.xaxis.set_major_locator(plt.MaxNLocator(3))
plt.yaxis.set_major_locator(plt.MaxNLocator(3))