夏普比率

def solve():
    import pandas as pd
    import numpy as np
    df = pd.read_csv(____)
    df['____'] = df['____'].pct_change()
    total_return = df['____'].iloc[-____] / df['____'].iloc[____] - ____
    days = len(____)
    annual_return = (____ + total_return) ** (____ / days) - ____
    annual_vol = df['____'].std() * np.sqrt(____)
    sharpe = annual_return / annual_vol
    print(____)