Looking for advice about "registry" implementation

[voltron]

I'm working on a plugin for one program and need to implement sort of "registry". In this registry I want to store objects, created by my plugin and also allow other plugins to add/remove objects to/from this registry.

Now, I'm using following approach. In the __init__.py of my plugin I have a list variable and set of functions to add/remove items to the list. Plugins, which want to add items to my registry need to import my module and call corresponding functions. Here is simplified code

In the my __init__.py

registry = []

def addToRegistry(toAdd):
    for item in registry:
        if item.name == toAdd.name and item.group == toAdd.group:
            return
    registry.append(toAdd)


def removeFromRegistry(toRemove):
    for item in registry[::-1]:
        if item.name == toRemove.name and item.group == toRemove.group:
            registry.remove(toRemove)


def addDirectory(folder):
    for d in os.listdir(folder):
        obj = fromFile(os.path.join(folder, d, "object.yaml"))
        if obj:
            addToRegistry(obj)


def removeDirectory(folder):
    for d in os.listdir(folder):
        obj = fromFile(os.path.join(folder, d, "object.yaml"))
        if obj:
            removeFromRegistry(obj)

In other plugins I use this code to add/remove data to/from "registry"

    try:
        from myplugin import addDirectory
        addDirectory(folder)
    except:
        pass

    ...
    try:
        from myplugin import removeDirectory
        removeDirectory(folder)
    except:
        pass

Maybe there are some other solutions? I was thinking about creating singleton registry class but not sure how flexible such solution will be in my case. Any advice is welcome.