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中级

实现API版本路由

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
    devs_csv = open_url(____).read()
    devs = pd.read_csv(StringIO(____))
    def route_version(____):
        if '____' in path: return '____'
        if '____' in path: return '____'
        return '____'
    def get_device_v1(____):
        row = devs[devs['____']==device_id]
        if row.empty: return None
        return row.iloc[____][['____','____','____']].to_dict()
    def get_device_v2(____):
        row = devs[devs['____']==device_id]
        if row.empty: return None
        d = row.iloc[____].to_dict()
        d['____'] = '____'; return d
    handlers = {'____': get_device_v1, '____': get_device_v2}
    paths = ['____', '____', '____']
    for path in paths:
        ver = route_version(____)
        did = path.split(____)[-____]
        result = handlers.get(____)(____)
        keys = list(result.keys()) if result else []
        print(____)

示例

输入
solve()
期望输出
/api/v1/devices/DEV001: ver=v1, fields=['device_id', 'device_name', 'status']
/api/v2/devices/DEV001: ver=v2, fields=['id', 'device_id', 'device_name', 'device_type', 'location_id', 'manufacturer', 'firmware_version', 'status', 'registered_at', 'last_seen_at', '_version']
/api/v1/devices/DEV004: ver=v1, fields=['device_id', 'device_name', 'status']
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