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

Question

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 

Answer 1

It took unexpectedly long, but it finished after several minutes. So problem solved.

Answer 2

Do

sudo apt-get install python-scipy 

for python2

or

sudo apt-get install python3-scipy 

if you don't care about the version. Installs within a few seconds on RPI3