first command to setup python env

python -m venv env

activate python env

source env/Scripts/activate

install Fastapi and unicorn

pip install fastapi uvicorn

make main.py file

touch main.py

main.py

from typing import Union

from fastapi import FastAPI

app = FastAPI()


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


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}

now start unicorn server

uvicorn main:app --reload --port=8000 --host=0.0.0.0

open this url

http://127.0.0.1:8000/

open swagger

http://127.0.0.1:8000/docs

close server

ctrl + c

now create requirements.txt file

pip freeze > requirements.txt

touch .dockerignore

.dockerignore file

env/
__pycache__/

*.env
*.env.*
env.*

make docker-compose.yaml file

touch docker-compose.yaml

docker-compose.yaml file

version: '3'

services:
  web:
    build: .
    command: sh -c "uvicorn main:app --reload --port=8000 --host=0.0.0.0"
    ports:
      - 8000:8000
    volumes:
      - .:/app

create Dockerfile file

# 
FROM python:3.9

# 
WORKDIR /app

COPY . /app
# 
RUN pip install --no-cache-dir --upgrade -r requirements.txt

now run this command to build and start docker container

docker compose up --build

now open these urls again

open this url

http://127.0.0.1:8000/

open swagger

http://127.0.0.1:8000/docs

to restart your docker build

docker compose up

That's it