Xticks not showing at all

Question

I wonder why my graph is not showing any xticks at all?
my code:

    ax = df.plot(x='A', y='B', marker = 'D', markersize=4)
    ax.set_xbound(lower=-40, upper=40)
    plt.xticks(np.arange(40, -40, 4), rotation=90)
    

Answer 1

You are actually doing wrong in

np.arange(40, -40, 4)

It is not giving any result.

If you are trying to get number from -40 to 40 with gap of 4 number then you may try this:

import numpy as np

np.arange(-40,40,4)

Or from 40 to -40 with gap of 4 number then this:

np.arange(40,-40,-4))

Take a look at documentation how to use arange.