Python flask directory structure for service layer? - python-3.x

Question

I'm an aspnet core developer and trying to do a test project in python using the flask framework. But because of my lack of understanding of the structure of python projects I'm having hard time compiling it. I don't understand why does it care if I keep my python file in another directory. In C# you can access all classes inside the same namespace without importing anything.
Here's my python flask project structure looks like. I can't seem to work it with this way. I'm trying to import my home_service.py inside home.py file where home routes are present (in aspnet's term controller) and the logger doesn't seem to be accessible either.
And home_service.py can't import db_util.py either.
Would any python flask expert please guide me in the right direction?
/../../Projects/flask-test-project
├── test-project/
│ ├── __init__.py
│ └── static/
│ └── site.css
│ ├── templates/
│ │ ├── layout.html
│ │ ├── home.html
│ │ ├── offerings.html
│ │ ├── login.html
│ │ ├── register.html
│ │ ├── 404.html
│ │ ├── 500.html
│ ├── views/
│ │ ├── __init__.py
│ │ ├── home.py
│ │ ├── offerings.py
│ │ ├── login.py
│ │ ├── register.py
│ ├── service/
│ │ ├── home_service.py
│ │ ├── db_util.py
├── flask-venv-for-ubuntu/
├── requirements.txt
└── run.py
**run.py**
from test-project import app
from datetime import datetime
import logging
todays_date = datetime.today().strftime('%Y%m%d')
logging.basicConfig(filename='error'+ todays_date+'.log',level=logging.Trace)
app.run(debug=True)
app.logger.trace(“Inside run.py”)
**__init__.py**
from flask import g, Blueprint, request
from psycopg2
# $ pip install sentry-sdk[flask]
from werkzeug.exceptions import HTTPException
app = Flask(__name__)
#app.errorhandler(404)
def not_found(error):
return render_template('404.html')
#app.errorhandler(HTTPException)
def handle_exception(e):
app.logger.error(e)
return render_template(“500.html”)
#app.teardown_appcontext
def close_connection():
db = getattr(g, '_database', None)
if db is not None:
db.close()
from test-project.views import home
from test-project.views import login
from test-project.views import register
from test-project.views import offerings
app.register_blueprint(home.mod)
app.register_blueprint(login.mod)
app.register_blueprint(register.mod)
app.register_blueprint(offerings.mod)
**db_util.py**
from flask import g
import psycopg2
POSTGRES_CONNECTIONSTRING = “……...”
def get_db():
db = getattr(g, '_database', None)
if db is None:
db = g._database = psycopg2.connect(POSTGRES_CONNECTIONSTRING)
return db
def query_db(query, args=(), one=False):
try:
cur = get_db().execute(query, args)
rv = cur.fetchall()
cur.close()
return (rv[0] if rv else None) if one else rv
finally:
if(cur)
cur.close()
**home_service.py**
import db_util
def get_something
app.logger.Debug(“get_something started”)
return query_db(“select count(*) as myCount from table1;”)
**home.py**
import home_service
mod = Flask(“home”,__name__)
#mod.route(“/something”)
def something():
app.logger.Debug(“get_something started”)
return render_template(“home.html”, count_of_table1=get_something().myCount)
Please don't recommend me to use SQLAlchemy or any other orm. I want to do it my way. Thanks!