Matplotlib高级-分组柱状图

def solve():
    import matplotlib.pyplot as plt
    import numpy as np
    labels = ['____', '____', '____']
    A = [____, ____, ____]
    B = [____, ____, ____]
    x = np.arange(len(____))
    width = ____
    plt.figure(figsize=(____, ____))
    plt.bar(____)
    plt.bar(____)
    plt.xticks(____)
    plt.legend()
    plt.savefig(____)
    plt.close()
    print(____)