风险管理-VaR参数法

def solve():
    import pandas as pd
    from scipy import stats
    df = pd.read_csv(____)
    df['____'] = df['____'].pct_change()
    mean = df['____'].mean()
    std = df['____'].std()
    var = -(mean - stats.norm.ppf(____) * std)
    print(____)