The actual culprit is python3-future which won't be fixed.
Please patch-out it's usage or see if it's already done upstream.
Greetings
$ grep future -r | grep -v __future__
setup.py: install_requires = ['numpy', 'future'],
mdp/utils/templet.py:from future.utils import with_metaclass
mdp/utils/introspection.py:from future import standard_library
mdp/test/test_online_flows_hinet.py:from future import standard_library
mdp/test/test_node_operations.py:from future import standard_library
mdp/test/test_hinet.py:from future import standard_library
mdp/test/test_flows.py:from future import standard_library
mdp/signal_node.py:from future import standard_library
mdp/signal_node.py:from future.utils import with_metaclass
mdp/parallel/thread_schedule.py:from future import standard_library
mdp/parallel/process_schedule.py:from future import standard_library
mdp/nodes/misc_nodes.py:from future import standard_library
mdp/linear_flows.py:from future import standard_library
mdp/hinet/htmlvisitor.py:from future import standard_library
mdp/extension.py:from future.utils import with_metaclass
mdp/configuration.py:from future.utils import with_metaclass
mdp/configuration.py:from future import standard_library
debian/control: python3-future,
debian/control:Depends: ${python3:Depends}, ${misc:Depends},
python3-numpy, python3-future
bimdp/nodes/autogen.py:from future import standard_library
bimdp/inspection/utils.py:from future import standard_library
bimdp/inspection/tracer.py:from future import standard_library
bimdp/inspection/facade.py:from future import standard_library
$ grep past -r
mdp/utils/templet.py:from past.builtins import basestring
mdp/utils/routines.py:from past.utils import old_div
mdp/utils/quad_forms.py:from past.utils import old_div
mdp/utils/progress_bar.py:from past.utils import old_div
mdp/utils/_symeig.py:from past.utils import old_div
mdp/test/test_utils.py:from past.utils import old_div
mdp/test/test_svm_classifier.py:from past.utils import old_div
mdp/test/test_scikits.py:from past.utils import old_div
mdp/test/test_parallelnodes.py:from past.utils import old_div
mdp/test/test_contrib.py:from past.utils import old_div
mdp/test/test_classifier.py:from past.utils import old_div
mdp/test/test_SFANode.py:from past.utils import old_div
mdp/test/test_SFA2Node.py:from past.utils import old_div
mdp/test/test_RBM.py:from past.utils import old_div
mdp/test/test_RBFExpansionNode.py:from past.utils import old_div
mdp/test/test_NeuralGasNode.py:from past.utils import old_div
mdp/test/test_ISFANode.py:from past.utils import old_div
mdp/test/test_ICANode.py:from past.utils import old_div
mdp/test/test_GrowingNeuralGasNode.py:from past.utils import old_div
mdp/test/test_GeneralExpansionNode.py:from past.utils import old_div
mdp/test/test_FDANode.py:from past.utils import old_div
mdp/test/test_FANode.py:from past.utils import old_div
mdp/test/_tools.py:from past.utils import old_div
mdp/nodes/xsfa_nodes.py:from past.utils import old_div
mdp/nodes/shogun_svm_classifier.py:from past.builtins import basestring
mdp/nodes/rbm_nodes.py:from past.utils import old_div
mdp/nodes/pca_nodes_online.py:from past.utils import old_div
mdp/nodes/pca_nodes.py:from past.utils import old_div
mdp/nodes/nipals.py:from past.utils import old_div
mdp/nodes/neural_gas_nodes.py:from past.utils import old_div
mdp/nodes/misc_nodes.py:from past.utils import old_div
mdp/nodes/mca_nodes_online.py:from past.utils import old_div
mdp/nodes/lle_nodes.py:from past.utils import old_div
mdp/nodes/jade.py:from past.utils import old_div
mdp/nodes/isfa_nodes.py:from past.utils import old_div
mdp/nodes/ica_nodes.py:from past.utils import old_div
mdp/nodes/expansion_nodes.py:from past.utils import old_div
mdp/nodes/em_nodes.py:from past.utils import old_div
mdp/nodes/classifier_nodes.py:from past.utils import old_div
mdp/hinet/switchboard.py:from past.utils import old_div
