mkdir file_upload_in_flask
   cd file_upload_in_flask

    pip install flask

  pip install sqlalchemy

from db.db import db
import datetime
   
class Profile(db.Model):
   id = db.Column(db.Integer, primary_key=True)
   img_name = db.Column(db.String(255), nullable=False)
   created_at = db.Column(db.DateTime, default=datetime.datetime.utcnow, nullable=False)

# configuration
class Config:
   DEBUG = True
   # db
   SQLALCHEMY_DATABASE_URI = 'mysql://root:root@localhost/djangoapp'
   SQLALCHEMY_TRACK_MODIFICATIONS = False

from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()

app = Flask(__name__)
app.config.from_object('settings.Config')
db = SQLAlchemy(app)

if __name__ == "__main__":
   app.run(debug=True)

import os

from flask import Flask, render_template, request, redirect, flash
from sqlalchemy.exc import IntegrityError
from werkzeug.utils import secure_filename

from db.db import db
from models.app_model import Profile

app = Flask(__name__)
app.secret_key = 'asrtarstaursdlarsn'
app.config.from_object('settings.Config')
app.config["IMAGE_UPLOADS"] = "./static/images/profiles"
app.config["ALLOWED_IMAGE_EXTENSIONS"] = ["JPEG", "JPG", "PNG", "GIF"]

# initialization
db.init_app(app)
    
    
    def allowed_image(filename):
        if not "." in filename:
            return False
        ext = filename.rsplit(".", 1)[1]
        if ext.upper() in app.config["ALLOWED_IMAGE_EXTENSIONS"]:
            return True
        else:
            return False
    
    
    @app.route('/', methods=['GET', 'POST'])
    def upload_file():
        if request.method == 'POST':
            image = request.files["img_name"]
            if image.filename == "":
                flash('Please Upload Image file', "danger")
                return redirect(request.url)
            if allowed_image(image.filename):
                filename = secure_filename(image.filename)
                try:
                    profile_entry = Profile(img_name=filename)
                    db.session.add(profile_entry)
                    db.session.commit()
                    image.save(os.path.join(app.config["IMAGE_UPLOADS"], filename))
                    flash('File upload Successfully !', "success")
                except IntegrityError as e:
                    flash('Something went wrong please try again later', "danger")
                    return redirect(request.url)
            else:
                flash('That file extension is not allowed', "danger")
                return redirect(request.url)
        profiles = Profile.query.all()
        return render_template('index.html', profiles=profiles)
    
    
    # run always put in last statement or put after all @app.route
    if __name__ == '__main__':
        app.run(host='localhost')

  python app.py