性别工资差距学术柱状图（学术图表）

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    import numpy as np
    
    url = 'https://liangdaima.com/static/data/wooldridge/wage1.csv'
    df = pd.read_csv(url)
    
    from scipy import stats
    plt.rcParams['font.size'] = 12
    male_wage = df[df['female']==0]['wage']
    female_wage = df[df['female']==1]['wage']
    means = [male_wage.mean(), female_wage.mean()]
    sems = [male_wage.sem(), female_wage.sem()]
    plt.figure(figsize=(8,6))
    plt.bar(['男性', '女性'], means, yerr=[s*1.96 for s in sems], color=['gray', 'gray'], edgecolor='black', capsize=5)
    plt.title('性别工资差距', 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"