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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(self):
 """Loads all modules."""

        if self._modules_loaded is True:
            return

        self.load_modules_from_python(routes.ALL_ROUTES)
        self.aliases.update(routes.ALL_ALIASES)
        self._load_modules_from_entry_points('softlayer.cli')

        self._modules_loaded = True