## Set up virtual environnement

At the root of your repository, first set up a python virtual environnement.

`$ python -m venv .venv`

This will be useful to keep track of the dependencies

[source](https://docs.python.org/3/library/venv.html)

Activate it 
`$ source .venv/bin/activate`

now you should see `(.venv) ~/Code/fastapi-corbia-telegram$ ` 

`pip install --upgrade pip`

`(.venv) ~/Code/fastapi-corbia-telegram$ pip install fastapi[all] uvicorn`

To save the dependency list, you can run the pip freeze command and send the output to a requirement.txt

`(.venv) ~/Code/fastapi-corbia-telegram$ pip freeze > requirements.txt`

Later on, when you deploy your application on a server, you will be able to run

`(.venv) pip install -r requirements.txt`

## Hello world

```python
from fastapi import FastAPI 

app = FastAPI() 

@app.get("/") 
def read_root(): 
	return {"Hello": "World"}

```


## Using Environnement Variables

For API authentication and database connection, basically anything that requires a "secret". We're gonna use environnement variables.

For development, we can write everything in a .env file that will be added to the .gitignore. In production, the content of the .env file will be placed in a "secret" file, usually in /etc/app_name/secret, that will be loaded as an Environnement file by the systemd service file. 

## Using ORMAR as an ORM