加载iris数据集并计算描述统计

def solve():
    import numpy as np
    from sklearn.datasets import load_iris

    iris = load_iris()
    sepal_length = iris.data[:, 0]
    mean_val = np.mean(sepal_length)
    median_val = np.median(sepal_length)
    std_val = np.std(sepal_length, ddof=1)
    print(f'{mean_val:.2f},{median_val:.2f},{std_val:.2f}')