can't install scipy – freezes on "Running setup.py install for scipy"

when I run

sudo pip install -U scipy

it is first downloaded and then it goes on to show

Running setup.py install for scipy

but it freezes there. I tried upgrading pip itself. Worked fine. My pip version is 1.5.4

The only error i get is InsecurePlatforWarning. The complete output looks like this:

tom@tom-ThinkPad-Edge-E430:~$ sudo pip install -U scipy
The directory '/home/tom/.cache/pip/http' or its parent directory
is not owned by the current user and the cache has been disabled.
Please check the permissions and owner of that directory. If
executing pip with sudo, you may want sudo's -H flag.
The directory '/home/tom/.cache/pip' or its parent directory is not
owned by the current user and caching wheels has been disabled.
check the permissions and owner of that directory. If executing pip with
sudo, you may want sudo's -H flag.
Collecting scipy
/usr/local/lib/python2.7/dist-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90:
InsecurePlatformWarning: A true SSLContext object is not available.
This prevents urllib3 from configuring SSL appropriately and
may cause certain SSL connections to fail. For more information, see
https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
InsecurePlatformWarning
Downloading scipy-0.16.1.tar.gz (12.2MB)
   100% |████████████████████████████████| 12.2MB 32kB/s 
Installing collected packages: scipy
   Running setup.py install for scipy