2. Python development - matplotlib drawing x-axis is stretched to any size

Matplotlib draws x-axis to any size and elongates:

When we use python's matplotlib for drawing, sometimes we find that the x-axis and y-axis of the drawn picture are in the same proportion, as shown in Figure 1 below; but sometimes we need to see a lot of data information on the x-axis, so we need The need to elongate the x-axis. The specific python implementation method is shown below, and the effect is shown in Figure 2 below:

Figure 1

import matplotlib.pyplot as plt

def demo_plot(x, y, x_maxsize, save_path):
    plt.figure()
    
    plt.plot(x, y)
    #plt.ylim((0, 1000))
    plt.title("Demo")
    plt.xlabel("x")
    plt.ylabel("y")
    
    # change x internal size
    plt.gca().margins(x=0)
    plt.gcf().canvas.draw()
    
    # set size
    maxsize = x_maxsize
    m = 0.2
    N =len(x)
    s = maxsize / plt.gcf().dpi * N + 2 * m
    margin = m / plt.gcf().get_size_inches()[0]
    
    plt.gcf().subplots_adjust(left=margin, right=1. - margin)
    plt.gcf().set_size_inches(s, plt.gcf().get_size_inches()[1])

    plt.savefig("%s%s.jpg"%(save_path, "Demo"), bbox_inches='tight')
    plt.close()

if __name__ == '__main__':
    x = [500,1000,1500,2000,2500,3000]
    y = [100,200,300,400,500,600]
    demo_plot(x, y, 200, 'C:/Users/xt/Desktop/')

The generated renderings are as follows:

Figure 2