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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 load_plugins(self):
 """ Load external plugins. Custodian is intended to interact with internal and external systems that are not suitable for embedding into the custodian code base. """

        try:
            from pkg_resources import iter_entry_points
        except ImportError:
            return
        for ep in iter_entry_points(group="custodian.%s" % self.plugin_type):
            f = ep.load()
            f()