Intellisense not available for flask-sqlalchemy

Environment data

• VS Code version: 1.30.2
• Extension version (available under the Extensions sidebar): 2018.12.1
• OS and version: macOS High Sierra 10.13.6
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.2
• Type of virtual environment used (N/A | venv | virtualenv | conda | …): venv
• Relevant/affected Python packages and their versions: flask-sqlalchemy

Expected behaviour

Show intellisense option for Column

Actual behaviour

Steps to reproduce:

# services/users/project/__init__.py


import os
from flask import Flask, jsonify
from flask_sqlalchemy import SQLAlchemy


# instantiate the app
app = Flask(__name__)

# set config
app_settings = os.getenv('APP_SETTINGS')
app.config.from_object(app_settings)

# instantiate the db
db = SQLAlchemy(app)


# model
class User(db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    fullname = db.Column(db.String(80))

User Settings

{
    "editor.renderWhitespace": "all",
    "files.associations": {
        "*.txt": "tsv"
    },
    "editor.renderControlCharacters": false,
    "workbench.startupEditor": "newUntitledFile",
    "explorer.confirmDragAndDrop": false,
    "python.venvPath": "~/.virtualenvs",
    "python.jediEnabled": false,
    "git.autofetch": true,
    "git.confirmSync": false
}

Workspace Settings

{
    "python.pythonPath": "/Users/nick.perkins/.virtualenvs/testdriven-app/bin/python",
    "python.linting.pylintArgs": ["--load-plugins", "pylint_flask"]
}

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

Starting Microsoft Python language server.
Microsoft Python Language Server version 0.1.75.0
Initializing for /Users/nick.perkins/.virtualenvs/testdriven-app/bin/python
Reloading modules... 
Reloading modules... 
done.
done.

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help; turn on source maps to make any tracebacks be useful by running Enable source map support for extension debugging)

[Plazmius]

I faced a similar issue. My first guess is that it is because attributes of class SQLAlchemy are initialized by setattr function (https://github.com/pallets/flask-sqlalchemy/blob/master/flask_sqlalchemy/__init__.py#L78-L81)

    for module in sqlalchemy, sqlalchemy.orm:
        for key in module.__all__:
            if not hasattr(obj, key):
                setattr(obj, key, getattr(module, key))

For example, Model is available: However, Column is not:

[DonJayamanne]

Dup of https://github.com/Microsoft/vscode-python/issues/2271