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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_plugin_from_string(plugin_name):
 """ Returns plugin or plugin point class from given ``plugin_name`` string. Example of ``plugin_name``:: 'my_app.MyPlugin' """

    modulename, classname = plugin_name.rsplit('.', 1)
    module = import_module(modulename)
    return getattr(module, classname)