# Calling Code Example

    import openpaperwork_core

    core = openpaperwork_core.Core()

    # Load mandatory plugins
    core.load("openpaperwork_plugin_a")
    core.load("mandatory_plugin_a")
    core.load("mandatory_plugin_b")

    # `init()` will load dependencies and call method `init()` on all the plugins
    # You can safely call `core.init()` many times
    core.init()

    # Load plugins requested by your user if any.
    # You can used previously loaded to get the plugin to load if you want.
    # For instance, you can load and initialize `openpaperwork_core.config`
    # and then use it to get a plugin list from a configuration file.
    core.load(...)

    core.init()

    nb_called = core.call_all('some_method_a', "random_argument")
    assert(nb_called > 0)

    return_value = core.call_success('some_method_a', "random_argument")
    assert(return_value is not None)