Python Matplotlib 并排显示两个相同大小的图像

import numpy as np
import matplotlib.pyplot as plt
import cv2 as cv
def show(img):
    if img.ndim == 2:
        plt.imshow(img, cmap='gray')
    else:
        plt.imshow(cv.cvtColor(img, cv.COLOR_BGR2RGB))
    plt.show()

show(np.hstack((a, b)))