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中级

实现点位树形结构解析

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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
    bld_csv = open_url(____).read()
    loc_csv = open_url(____).read()
    scr_csv = open_url(____).read()
    buildings = pd.read_csv(StringIO(____))
    locations = pd.read_csv(StringIO(____))
    screens = pd.read_csv(StringIO(____))
    def build_tree(____):
        bld = buildings[buildings['____']==bid].iloc[____]
        locs = locations[locations['____']==bid]
        result = {'____':bid,'____':bld['____'],'____':bld['____'],'____':[]}
        for _, loc in locs.iterrows():
            scrs = list(____)
            result['____'].append({'____':loc['____'],'____':int(____),'____':loc['____'],'____':scrs})
        return result
    tree = build_tree(____)
    print(____)
    for loc in tree['____'][:____]:
        print("____"+loc['____']+"____"+str(____)+"____"+loc['____']+"____"+str(____))
    print("____"+str(len(____)))

示例

输入
solve()
期望输出
Tree BLD-001: 朝阳时代01号 region=朝阳
  LOC LOC-0001 floor=7 elev=E2 screens=['SCR-0001']
  LOC LOC-0051 floor=7 elev=E2 screens=['SCR-0051']
  LOC LOC-0101 floor=2 elev=E4 screens=['SCR-0101']
Total locations: 4
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