Can't import flask because werkzeug
I faced same issue. 
I got this error when working in python virtual environment. 
I had to deactivate virtual environment. Then go to root user and install werkzeug using pip. After that it works in virtual environment.
When I use from flask import *, I get the error

ImportError: No module named werkzeug.exceptions

However, when I do pip freeze, I can see that Werkzeug==0.11.11 is indeed installed.  How can I fix this?