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中级

实现访问策略矩阵检查

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
    from io import StringIO
    import pandas as pd
    groups_csv = open_url(____).read()
    policies_csv = open_url(____).read()
    devs_csv = open_url(____).read()
    groups = pd.read_csv(StringIO(____))
    policies = pd.read_csv(StringIO(____))
    devs = pd.read_csv(StringIO(____))
    def can_access(____):
        g = groups[groups['____']==group_name]
        if g.empty: return False
        gid = g.iloc[____]['____']
        dev = devs[devs['____']==device_id]
        if dev.empty: return False
        dtype = dev.iloc[____]['____']
        dloc = dev.iloc[____]['____']
        pol = policies[(____) & ((____)|(____))]
        if pol.empty: return False
        if action == '____': return bool(____)
        if action == '____': return bool(____)
        return False
    tests = [(____),(____),(____),(____),(____)]
    for grp,did,act in tests:
        ok = can_access(____)
        print(____)

示例

输入
solve()
期望输出
admin read DEV001: True
admin command DEV004: True
readonly read DEV001: True
readonly command DEV001: False
operator command DEV004: True
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