ImportError: cannot import name 'app'

Question

I have been working on this for 5+ hours and it seems like it should be rather simple. I followed the instructions to set up a flask application on apache via mod_wsgi and after finishing them I am getting an error that

ImportError: cannot import name 'app'

from the line:

from web_tool import app as application

of my wsgi file that is called web_tool.wsgi and looks like:

import sys  
sys.path.insert(0, "/path/web_tool/src/")
print(sys.version)
print(sys.path)

from web_tool import app as application

My python version and system path are correct at least so I believe.

And then my virtualhost file, which is stored in apache2/sites-available/default looks like:

WSGIPythonHome /usr/local/opt/python-3.4.1

<VirtualHost *:4000>

    ServerName my.servername.com
    WSGIDaemonProcess web_tool user=my_username group=my_group threads=5
    WSGIScriptAlias / /path/web_tool/src/web_tool/web_tool.wsgi
    WSGIApplicationGroup %{GLOBAL}

    <Directory /path/web_tool/src/web_tool/>
        WSGIProcessGroup cnt_tool
        Order deny,allow
        Allow from all
    </Directory>
</VirtualHost>

Do you see any errors, should my wsgi file be called the same as my python file? I'm running python 3.4 and mod_wsgi 3.4.

Solution

After being prompted by abarnert I realized that it wasn't a problem in the larger structure of Flask and Apache but simply with the structure of my import. So my solution that got it working was to make sure first that I did

from web_tool import web_tool as application

Because my project structure looks like

/path/web_tool/src/web_tool/
    web_tool.py
    web_tool.wsgi

I think naming the folder the same as the main python script the same confused but then I got it straight. Now the above import still didn't work because I got a module error but what did work was:

from web_tool import web_tool
application = web_tool.app

I didn't see this structure anywhere else online or in any other SO answers but that is probably because of my particular project structure.

Comments

[renatov]

That worked for me too, but I had to add a blank __init__.py file in that folder in order to work.