pip install vprof ImportError: No module named download

[bw2]

Description

error when attempting to install vprof using pip for python2.7

How to reproduce

$ pip install vprof
Collecting vprof
Using cached https://files.pythonhosted.org/packages/0b/2b/5b690c8bd73231216c82180b7b162cf433dd98d6212b19a7374c5cf09622/vprof-0.36.1.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "", line 1, in
File "/private/var/folders/4k/jh2hjdp10jj7g6346ydf96v8k_60_2/T/pip-install-qdjgEb/vprof/setup.py", line 12, in
from pip.download import PipSession
ImportError: No module named download

Version and platform

$ pip --version
pip 10.0.1 from /usr/local/lib/python2.7/site-packages/pip (python 2.7)
MacOSX 10.12.6