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中级

统计作业提交率（已交/应交）

未完成
中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    from pyodide.http import open_url
    instructors_csv = open_url(____).read()
    courses_csv = open_url(____).read()
    students_csv = open_url(____).read()
    enrollments_csv = open_url(____).read()
    assignments_csv = open_url(____).read()
    submissions_csv = open_url(____).read()
    import sqlite3
    import pandas as pd
    from io import StringIO

    conn = sqlite3.connect(____)
    pd.read_csv(StringIO(____)).to_sql(____)
    pd.read_csv(StringIO(____)).to_sql(____)
    pd.read_csv(StringIO(____)).to_sql(____)

    enrolled = pd.read_sql_query(____)
    assignments = pd.read_sql_query(____)
    submitted = pd.read_sql_query(____)

    df = enrolled.merge(____).merge(____).fillna(____)
    df['____'] = df['____'] * df['____']
    df['____'] = (____).round(____)
    df = df[['____','____','____','____','____']].sort_values(____)
    print(df.to_string(____))
    conn.close()

示例

输入
solve()
期望输出
course_id  enrolled  total_expected  total_submitted  submit_rate
        13         2               2              2.0        100.0
         6         4               8              4.0         50.0
         4         3               6              3.0         50.0
         2         5              15              7.0         46.7
         1         7              21              7.0         33.3
         7         3               3              1.0         33.3
         5         3               3              1.0         33.3
         3         2               2              0.0          0.0
         9         2               2              0.0          0.0
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