季节性分析CPI月度分解

def solve():
    import pandas as pd
    import matplotlib.pyplot as plt
    url = '____'
    df = pd.read_csv(____)
    annual_avg = df.groupby(____)['____'].transform(____)
    df['____'] = df['____']/annual_avg
    si = df.groupby(____)['____'].mean()
    print(si.round(____))
    si.plot(____)
    plt.xlabel(____); plt.ylabel(____); plt.title(____)
    plt.xticks(____); plt.tight_layout(); plt.show()