You can do it in several ways. I would suggest two of them.
First suggestion: Create a coders package containing the coders modules
~/application/__init__.py
~/application/coders/__init__.py
~/application/coders/foo.py
~/application/coders/bar.py
~/application/views.py
~/application/urls.py
...
You can import the coders functions in the views module:
from application.coders.foo import foo_coder_fucntion
from application.coders.bar import bar_coder_function
Second suggestion: Create a views package and dedicate a module view to each coder
~/application/__init__.py
~/application/views/foo.py
~/application/views/bar.py
~/application/views/main.py
~/application/urls.py
...
In the module you start the flask application:
import application.views.foo
import application.views.bar
import application.views.main
I prefer the first one.