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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

Not sure if it's needed at all.
There are plenty of things python don't give guarantees about, like class interface, parameter types, etc.
That's because python is for grown ups.

** Changed in: neutron
       Status: In Progress => Opinion

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https://bugs.launchpad.net/bugs/1343177

Title:
  Lack of singleton guarantee

Status in OpenStack Neutron (virtual network service):
  Opinion

Bug description:
  The current neutron's code require a singleton in some case, e.g., some class requires to be singleton.
  However, there is no mechanism to guarantee this.
  For example, in neutron.manager.NeutronManager class, the comments say "The caller should make sure that NeutronManager is a singleton".
  This kind of implementation is not only unsafe to assure the protection, but also make the caller to handler unnecessary efforts.

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