Iris特征分布可视化

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    df = pd.read_csv(____)
    features = ["____", "____", "____", "____"]
    fig, axes = plt.subplots(____, ____, figsize=(____, ____))
    colors = {"____": "____", "____": "____", "____": "____"}
    for ax, feat in zip(axes.ravel(), features):
        for sp, c in colors.items():
            ax.hist(____)
        ax.set_title(____); ax.legend()
    plt.tight_layout(); plt.show()
    print(____)