Python ImportError: No module named ext - python-2.7

Question

When i running my code I am getting following error saying ImportError: No module named ext
Code sample causing error
import module.model
module.model.dropdb(input)
module.model.createdb(input)
The trace back as follows
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "module/models/__init__.py", line 54, in drop_db
drop_db_with_migrations(quiet)
File "module/models/__init__.py", line 31, in drop_db_with_migrations
from module.app import db
File "module/app.py", line 42, in <module>
app.jinja_env.add_extension('hamlpy.ext.HamlPyExtension')
File "/vagrant-dev/opt/dev_virtualenv/local/lib/python2.7/site-packages/Jinja2
-2.6-py2.7.egg/jinja2/environment.py", line 288, in add_extension
self.extensions.update(load_extensions(self, [extension]))
File "/vagrant-dev/opt/dev_virtualenv/local/lib/python2.7/site-packages/Jinja2
-2.6-py2.7.egg/jinja2/environment.py", line 75, in load_extensions
extension = import_string(extension)
File "/vagrant-dev/opt/dev_virtualenv/local/lib/python2.7/site-packages/Jinja2
-2.6-py2.7.egg/jinja2/utils.py", line 213, in import_string
return getattr(__import__(module, None, None, [obj]), obj)
ImportError: No module named ext

Answer 1

Your problem is in your Traceback:
Traceback (most recent call last):
-- SNIP --
File "module/app.py", line 42, in <module>
app.jinja_env.add_extension('hamlpy.ext.HamlPyExtension')
-- SNIP --
ImportError: No module named ext
Jinja2 uses the dunder import mechanism __import__(some_package_name_string). It's unable to find a subpackage ext in your hamlpy package.