python virtualenv errors

gistfile1.txt

pparissis at poseidonas in ~
python -c "import sys, pprint; pprint.pprint(sys.path)"
['',
 '/usr/lib/python2.7',
 '/usr/lib/python2.7/plat-x86_64-linux-gnu',
 '/usr/lib/python2.7/lib-tk',
 '/usr/lib/python2.7/lib-old',
 '/usr/lib/python2.7/lib-dynload',
 '/usr/local/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages',
 '/usr/lib/python2.7/dist-packages/PILcompat',
 '/usr/lib/python2.7/dist-packages/gtk-2.0']
pparissis at poseidonas in ~
workon python3
(python3) pparissis at poseidonas in ~
python -c "import sys, pprint; pprint.pprint(sys.path)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/pprint.py", line 40, in <module>
    import types as _types
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/types.py", line 166, in <module>
    import functools as _functools
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/functools.py", line 23, in <module>
    from weakref import WeakKeyDictionary
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/weakref.py", line 12, in <module>
    from _weakref import (
ImportError: cannot import name '_remove_dead_weakref'
(python3) pparissis at poseidonas in ~ *1
deactivate
pparissis at poseidonas in ~
workon python3
(python3) pparissis at poseidonas in ~
python -c "import sys, pprint; pprint.pprint(sys.path)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/pprint.py", line 40, in <module>
    import types as _types
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/types.py", line 166, in <module>
    import functools as _functools
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/functools.py", line 23, in <module>
    from weakref import WeakKeyDictionary
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/weakref.py", line 12, in <module>
    from _weakref import (
ImportError: cannot import name '_remove_dead_weakref'
(python3) pparissis at poseidonas in ~ *1
pip list
Traceback (most recent call last):
  File "/home/pparissis/.virtualenvs/python3/bin/pip", line 7, in <module>
    from pip import main
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/site-packages/pip/__init__.py", line 4, in <module>
    import locale
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/locale.py", line 19, in <module>
    import functools
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/functools.py", line 23, in <module>
    from weakref import WeakKeyDictionary
  File "/home/pparissis/.virtualenvs/python3/lib/python3.5/weakref.py", line 12, in <module>
    from _weakref import (
ImportError: cannot import name '_remove_dead_weakref'
(python3) pparissis at poseidonas in ~ *1