ImportError: cannot import name 'Union' from '_ctypes' (unknown location)

[ciuffoly]

bash-3.2# PYTHONPATH=/usr/local/lib/python2.7/distutils
bash-3.2# export PYTHONPATH
bash-3.2# pwd
/sun-temp/pysftp-0.2.9
bash-3.2# /usr/local/bin/python setup.py install
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site.py", line 563, in <module>
main()
File "/usr/local/lib/python2.7/site.py", line 545, in main
known_paths = addusersitepackages(known_paths)
File "/usr/local/lib/python2.7/site.py", line 278, in addusersitepackages
user_site = getusersitepackages()
File "/usr/local/lib/python2.7/site.py", line 258, in getusersitepackages
from sysconfig import get_path
ImportError: cannot import name get_path