Traceback (most recent call last):
  File "/usr/local/bin/jupyter-nbconvert", line 7, in <module>
    from nbconvert.nbconvertapp import main
  File "/usr/local/lib/python2.7/dist-packages/nbconvert/__init__.py", line 4, in <module>
    from .exporters import *
  File "/usr/local/lib/python2.7/dist-packages/nbconvert/exporters/__init__.py", line 1, in <module>
    from .base import (export, get_exporter, 
  File "/usr/local/lib/python2.7/dist-packages/nbconvert/exporters/base.py", line 13, in <module>
    from nbformat import NotebookNode
  File "/usr/local/lib/python2.7/dist-packages/nbformat/__init__.py", line 32, in <module>
    from .validator import validate, ValidationError
  File "/usr/local/lib/python2.7/dist-packages/nbformat/validator.py", line 23, in <module>
    raise ImportError(str(e) + verbose_msg)
ImportError: No module named zipp

    Jupyter notebook format depends on the jsonschema package:

        https://pypi.python.org/pypi/jsonschema

    Please install it first.