查询未批改的提交记录

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    csv_data = open_url('https://data.zuihe.com/dbd/ms-edulive/state_03/submissions.csv').read()
    df = pd.read_csv(StringIO(csv_data))
    ungraded = df[df['teacher_comment'].isna() & df['status'].isin(['submitted', 'late'])]
    print(f'未批改数量: {len(ungraded)}')
    for _, r in ungraded.head(5).iterrows():
        print(f"{r['submission_id']}: {r['user_id']}")