实现设备状态Cache-Aside

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    cache_csv = open_url(____).read()
    cache = pd.read_csv(StringIO(____))
    reads = cache[cache['____']=='____']
    total_reads = len(____)
    hits = int(reads['____'].sum())
    hit_rate = hits/total_reads if total_reads > ____ else ____
    print("____" + str(____))
    print("____" + str(____) + "____" + str(round(____)) + "____")
    print("____" + str(____))
    print(____)
    for _, row in reads.head(____).iterrows():
        action = "____" if row['____'] else "____"
        print(____)