Matplotlib样式-设置图例

def solve():
    import matplotlib.pyplot as plt
    plt.figure(figsize=(8, 6))
    plt.plot([1, 2, 3], [1, 2, 3], label='Line 1')
    plt.plot([1, 2, 3], [3, 2, 1], label='Line 2')
    plt.legend()
    plt.savefig('legend.png')
    plt.close()
    print('图表已保存')