Optimization of images with FastAPI

pip3 install FastAPI uvicorn Pillow

from fastapi import FastAPI, UploadFile, File, BackgroundTasksfrom fastapi.responses import JSONResponsefrom os import getcwdfrom PIL import Imageapp = FastAPI()PATH_FILES = getcwd() + "/"# RESIZE IMAGES FOR DIFFERENT DEVICESdef 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 Image720_dogs.jpg # Resolution 1280 x 720480_dogs.jpg # Resolution 640 x 480