matplotlib中在for中画出多张图

import matplotlib.pyplot as plt

import numpy as np

fig, axes = plt.subplots(2, 2)

def showim():

    for i in range(2):

        for j in range(2):

            axes[i,j].plot(np.random.randint(10,size=10))

            # 为每个子图添加标题

            axes[i,j].set_title("picture "+str(i)+" "+str(j))

            fig.tight_layout()

            # 为每个子图去掉坐标轴刻度

            axes[i,j].set_xticks([])

            axes[i,j].set_yticks([])

showim()

plt.show()