绘制箱线图

def solve():
    import matplotlib
    matplotlib.use('Agg')
    import matplotlib.pyplot as plt
    import numpy as np
    from sklearn.datasets import load_iris
    iris = load_iris()
    X = iris.data
    plt.figure(figsize=(10, 6))
    plt.boxplot([X[:, i] for i in range(4)], labels=iris.feature_names)
    plt.title('Iris Features Boxplot')
    plt.tight_layout()
    plt.show()
    print(f'{np.median(X[:, 0]):.2f}')