How can I run flask in Windows? [duplicate]

set FLASK_APP=newproj
set FLASK_ENV=development
flask run

C:\Users\name\abc> venv\Scripts\activate

pip install Flask

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
   return 'Hello World’

if __name__ == '__main__':
   app.run()

python hello.py

# app.run(debug = True)

app.run(host='127.0.0.1',port=8000,debug=True)

$ export FLASK_APP=app.py # your python file name
$ set FLASK_APP = app.py
$ export FLASK_ENV=development
$ set FLASK_DEBUG = True
$ flask run