Actually I am learning python flask Navigation, I installed all the necessary packages successfully, these are some of the packages,
app$ venv/bin/easy_install flask-restful
app$ venv/bin/easy_install Flask-bootstrap
app$ venv/bin/easy_install Flask-Navigation
but when I am tring to import
from flask_nav import Nav
or
from flask_nav.elements import Navbar, View
getting error,
>>>from flask_nav import register_renderer
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named 'flask_nav'
I am using ubuntu-14.02 and Python 3.4.3. How do i fix this error, any solution.
According to Flask-Navigation documentation, you should be importing Navigation and not Nav
from flask import Flask
from flask.ext.navigation import Navigation
app = Flask(__name__)
nav = Navigation(app)
You might be confusing Flask-Navigation with Flask-Nav which is installed under the package name flask-nav.
From the documentation, here are some differences between Flask-Nav to Flask-Navigation:
Flask-Nav owes a some good core ideas to Flask-Navigation, which is about a year older and the first place the author looked before deciding to write Flask-Nav. In defense of the reimplementation. Here are some key differences:
- Flask-Navigation rolls all element types into a single Item class, which serves as label, view and link element. This makes it a little hard to extend.
- The HTML generation in Flask-Navigation is done inside the package itself, while Flask-Nav uses a more complete, external solution.
- Navigational structure creation and rendering are separate in Flask-Nav (see Renderer). This allows for more than one way of rendering the same navbar, allowing other packages (such as Flask-Bootstrap) to supply renderers as well.
- Some technical choices were deemed a little strange and have been avoided (BoundTypeProperty)
- While Flask-Navigation uses signals and hooks to regenerate navigation bars on every request, Flask-Nav achieves dynamic behaviour by lazily instantiating naviigation bars when they are needed and at the last possible moment.