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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_project(self, name):
 """ For a given project, get a dictionary mapping available versions to Distribution instances. This calls _get_project to do all the work, and just implements a caching layer on top. """

        if self._cache is None:  # pragma: no cover
            result = self._get_project(name)
        elif name in self._cache:
            result = self._cache[name]
        else:
            self.clear_errors()
            result = self._get_project(name)
            self._cache[name] = result
        return result