File: utils.py

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"""
Utility functions/classes for the extension
"""


class _Singleton(type):
    _instances = {}

    def __call__(cls, *args, **kwargs):
        if cls not in cls._instances:
            cls._instances[cls] = super(_Singleton, cls).__call__(*args, **kwargs)
        return cls._instances[cls]


class Singleton(_Singleton("SingletonMeta", (object,), {})):
    pass