实现服务注册与发现

def solve():
    from pyodide.http import open_url
    from io import StringIO
    service_registry_csv = open_url(____).read()
    import pandas as pd
    from io import StringIO
    registry = pd.read_csv(StringIO(____))
    class ServiceRegistry:
        def __init__(____):
            self.store = {}
        def register(____):
            self.store.setdefault(____)[instance_id] = {
                '____':host,'____':weight,'____':version,'____':'____'}
            return True
        def deregister(____):
            svc = self.store.get(____)
            if instance_id in svc: del svc[instance_id]; return True
            return False
        def discover(____):
            svc = self.store.get(____)
            return [{'____':iid,**info} for iid,info in svc.items() if info['____']=='____']
    sr = ServiceRegistry()
    for _, row in registry.iterrows():
        sr.register(row['____'], row['____'], row['____'], int(____), row['____'])
    sr.deregister(____)
    for svc_name in ['____','____','____']:
        instances = sr.discover(____)
        print(____)