decorator meant to build singletons, and designed for async coroutines

python_async_cache_decorator.py

def async_cache(func):
    """
    decorator meant to build singletons, and designed for async coroutines
    :param func:
    :return:
    """
    instances = {}

    @functools.wraps(func)
    async def wrapper(*args, **kwargs):
        if func not in instances:
            instances[func] = await func(*args, **kwargs)
        return instances[func]

    return wrapper