利润表分析：行业毛利率中位数对标

"____""____""____"

metadata = {
    "____": "____",
    "____": "____",
    "____": "____",
    "____": "____",
    "____": ["____"],
    "____": ["____", "____", "____"],
    "____": ____
}

# 题目描述
"____""____""____"

def solve():
    import pandas as pd
    from pyodide.http import open_url
    from io import StringIO

    BASE_URL = "____"
    df = pd.read_csv(StringIO(open_url(____).read()))

    df = df[(____) & (____)].copy()
    df = df.dropna(____)
    df = df[df['____'] > ____]
    df['____'] = (____) / df['____']

    result = df.groupby(____).agg(
        公司数量=(____),
        毛利率中位数=(____)
    ).reset_index()
    result['____'] = result['____'].round(____)
    result = result.sort_values(____).head(____).reset_index(____)

    return result.to_string()

if __name__ == "____":
    print(solve())