Set grid frequency for plot

Question

I have a very simple code that plots points by coordinates (x, y)

def separate_file(coordinates):
    new_document_x, new_document_y = zip(*coordinates)
    plt.gca().invert_yaxis()
    plt.plot(new_document_x, new_document_y, "r", marker='.', linestyle='None')
    plt.show()

print(separate_file(
[[184, 60], [33, 76], [33, 128], [33, 180], [327, 149], [33, 325], [399, 598], [221, 625]]
))

output

But I would like to add a grid to this graph. On the x-axis with a frequency of 100, and on the y-axis with a frequency of 200.

I tried some options from the internet but didn't get the desired result. Please tell me how can I achieve this

Answer 1

You could play with the Axis ticks to make your custom grid (same logic described here) :

import matplotlib.pyplot as plt

def separate_file(coo, xoff=100, yoff=200):
    def mloc(axis, mul):
        axis.set_major_locator(plt.MultipleLocator(mul))
        axis.set_minor_locator(plt.MultipleLocator(mul/2))
        axis.set_minor_formatter(plt.ScalarFormatter())
        
    ax = plt.gca()
    ax.invert_yaxis()
    ax.scatter(*zip(*coo), c="blue", s=10, zorder=2)

    # grid
    mloc(ax.xaxis, xoff)
    mloc(ax.yaxis, yoff)
    ax.tick_params(which="both", length=3)
    ax.grid(which="major", c="orange", lw=1.5)

    plt.show()