外貌评分平均工资（分组比较）

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    import numpy as np
    
    url = 'https://liangdaima.com/static/data/wooldridge/beauty.csv'
    df = pd.read_csv(url)
    
    look_means = df.groupby('belavg')['wage'].mean()
    plt.figure(figsize=(10,6))
    plt.bar(['低于平均', '高于平均'], look_means.values, color=['coral', 'steelblue'], alpha=0.7)
    plt.title('不同外貌评分平均工资', fontsize=14)
    plt.ylabel('平均工资', fontsize=12)
    plt.grid(axis='y', alpha=0.3)
    plt.tight_layout()
    plt.show()
    return "可视化代码执行完成"