绘制PACF偏自相关函数图

import pandas as pd
import matplotlib
matplotlib.use(____)
import matplotlib.pyplot as plt
from statsmodels.graphics.tsaplots import plot_pacf
from statsmodels.tsa.stattools import pacf

def solve():
    url = '____'
    df = pd.read_excel(____)
    d_sz = df['____'].diff().dropna()
    fig, ax = plt.subplots(figsize=(____, ____))
    plot_pacf(____)
    plt.title(____)
    plt.tight_layout()
    plt.show()
    pacf_vals = pacf(____)
    print(____)