加载就诊记录并统计诊断分布与费用

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    visits=pd.read_csv(StringIO(open_url("https://data.zuihe.com/dbd/ms-medibook/state_02/visits.csv").read()))
    print(f"Total visits: {len(visits)}")
    print(f"By status: {dict(visits.groupby('status').size())}")
    print(f"Avg treatment_fee: {round(visits['treatment_fee'].mean(),1)}")
    print(f"Avg duration_min: {round(visits['duration_min'].mean(),1)}")
    print("Top 5 diagnoses:")
    for d,c in visits.groupby('diagnosis').size().nlargest(5).items():
        print(f"  {d}: {c}")