'module' object has no attribute 'lru_cache'

Hi,

I'm trying to upgrade my development server to Django 2.0 using setup.py
develop command:

erob@marina:~/ncvs/django$ sudo python setup.py develop
Traceback (most recent call last):
  File "setup.py", line 32, in <module>
    version = __import__('django').get_version()
  File "/home/erob/ncvs/django/django/__init__.py", line 1, in <module>
    from django.utils.version import get_version
  File "/home/erob/ncvs/django/django/utils/version.py", line 61, in
<module>
    @functools.lru_cache()
AttributeError: 'module' object has no attribute 'lru_cache'

Why does the setup.py script attempt to import the django package?

Is it possible to upgrade Django from source when release 1.11.6 is
already installed in /usr/local ?

Thank you in advance,

Etienne

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