fresh install not working with python2.7, reasons?

[ungentilgarcon]

pip2.7 install git+http://github.com/topogram/topogram.git#egg=topogram 1 ↵
Traceback (most recent call last):
File "/usr/local/bin/pip2.7", line 7, in
from pip import main
File "/usr/lib/python2.7/dist-packages/pip/init.py", line 74, in
from pip.vcs import git, mercurial, subversion, bazaar # noqa
File "/usr/lib/python2.7/dist-packages/pip/vcs/mercurial.py", line 9, in
from pip.download import path_to_url
File "/usr/lib/python2.7/dist-packages/pip/download.py", line 22, in
import requests, six
File "/usr/share/python-wheels/requests-2.4.3-py2.py3-none-any.whl/requests/init.py", line 75, in
File "/usr/share/python-wheels/urllib3-1.9.1-py2.py3-none-any.whl/urllib3/contrib/pyopenssl.py", line 55, in
File "/usr/local/lib/python2.7/dist-packages/OpenSSL/init.py", line 8, in
from OpenSSL import rand, crypto, SSL
File "/usr/local/lib/python2.7/dist-packages/OpenSSL/rand.py", line 11, in
from OpenSSL._util import (
File "/usr/local/lib/python2.7/dist-packages/OpenSSL/_util.py", line 6, in
from cryptography.hazmat.bindings.openssl.binding import Binding
File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/bindings/openssl/binding.py", line 13, in
from cryptography.hazmat.bindings._openssl import ffi, lib
AttributeError: 'module' object has no attribute '_init_cffi_1_0_external_module'