Optimization of images with FastAPI

pip3 install fastapi uvicorn Pillow

from fastapi import FastAPI, UploadFile, File, BackgroundTasks
from fastapi.responses import JSONResponse
from os import getcwd
from PIL import Image

app = FastAPI()

PATH_FILES = getcwd() + "/"


# RESIZE IMAGES FOR DIFFERENT DEVICES

def resize_image(filename: str):
    sizes = [{
        "width": 1280,
        "height": 720
    }, {
        "width": 640,
        "height": 480
    }]

    for size in sizes:
        size_defined = size['width'], size['height']

        image = Image.open(PATH_FILES + filename, mode="r")
        image.thumbnail(size_defined)
        image.save(PATH_FILES + str(size['height']) + "_" + filename)
    print("success")


@app.post("/upload/file")
async def upload_file(background_tasks: BackgroundTasks, file: UploadFile = File(...)):

    # SAVE FILE ORIGINAL
    with open(PATH_FILES + file.filename, "wb") as myfile:
        content = await file.read()
        myfile.write(content)
        myfile.close()

    # RESIZE IMAGES
    background_tasks.add_task(resize_image, filename=file.filename)
    return JSONResponse(content={"message": "success"})

dogs.jpg # Original Image

720_dogs.jpg # Resolution 1280 x 720

480_dogs.jpg # Resolution 640 x 480