Use absolute paths for imports

app/main/__init__.py

@@ -3,4 +3,4 @@ from flask import Blueprint
 main = Blueprint('main', __name__)
 
 
-from .views import index
+from app.main.views import index

app/main/views/index.py

@@ -1,4 +1,4 @@
-from .. import main
+from app.main import main
 
 
 @main.route('/index')