install django setup file in python 2.7 : i am install diango setup up file than eroor is  
hari@hari-HP-Pavilion-g6-Notebook-PC:~/Downloads/django-master$ sudo python setup.py install
Traceback (most recent call last):
  File "setup.py", line 32, in <module>
    version = __import__('django').get_version()
  File "/home/hari/Downloads/django-master/django/__init__.py", line 1, in <module>
    from django.utils.version import get_version
  File "/home/hari/Downloads/django-master/django/utils/version.py", line 60, in <module>
    @functools.lru_cache()
AttributeError: 'module' object has no attribute 'lru_cache'
how to fix this error plz help me....