pi@raspberrypi ~ $ sudo pip-3.2 install --verbose  plotly
Downloading/unpacking plotly
  Could not fetch URL http://pypi.python.org/simple/plotly: HTTP Error 403: SSL is required
  Will skip URL http://pypi.python.org/simple/plotly when looking for download links for plotly
  Could not fetch URL http://pypi.python.org/simple/: HTTP Error 403: SSL is required
  Will skip URL http://pypi.python.org/simple/ when looking for download links for plotly
  Cannot fetch index base URL http://pypi.python.org/simple/
  Could not fetch URL http://pypi.python.org/simple/plotly/: HTTP Error 403: SSL is required
  Will skip URL http://pypi.python.org/simple/plotly/ when looking for download links for plotly
  Could not find any downloads that satisfy the requirement plotly
No distributions at all found for plotly
Exception information:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 104, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 245, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/usr/lib/python3/dist-packages/pip/req.py", line 978, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "/usr/lib/python3/dist-packages/pip/index.py", line 157, in find_requirement
    raise DistributionNotFound('No distributions at all found for %s' % req)
pip.exceptions.DistributionNotFound: No distributions at all found for plotly

Storing complete log in /root/.pip/pip.log