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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 iam_configuration(self):
 """Retrieve IAM configuration for this bucket. :rtype: :class:`IAMConfiguration` :returns: an instance for managing the bucket's IAM configuration. """

        info = self._properties.get("iamConfiguration", {})
        return IAMConfiguration.from_api_repr(info, self)