Redirecting Within A Helper Function - Flask

redirect.py

from flask import Flask, redirect
from werkzeug.routing import RoutingException, HTTPException

app = Flask(__name__)

@app.route('/')
def hello_world():
	def helper_function():
		# Attempt #1
		# this obviously won't work: return redirect('www.google.com')
		# the program would just return 'Hello World!'
		
		# Attempt #2
		# THIS IS PERMANENT!: raise RequestRedirect('example2')
		# your browser will cache the status 301 and ALWAYS redirect
		# explanation: http://stackoverflow.com/a/16371787/1364191
		
		# Attempt #3
		class RequestRedirect(HTTPException, RoutingException):
			"""Raise if the map requests a redirect. This is for example the case if
			`strict_slashes` are activated and an url that requires a trailing slash.
			The attribute `new_url` contains the absolute destination url.
			The attribute `code` is returned status code.
			"""
			def __init__(self, new_url, code=301):
				RoutingException.__init__(self, new_url)
				self.new_url = new_url
				self.code = code
			def get_response(self, environ):
				return redirect(self.new_url, self.code)
				
		raise RequestRedirect('example3', code=302)
	helper_function()
	return 'Hello World!'
	
@app.route('/example2')
def example2():
	return 'Example 2'
	
@app.route('/example3')
def example3():
	return 'Example 3'

if __name__ == '__main__':
    app.run(host="0.0.0.0", port=9999, debug=True)

Thanks for the example, super helpful!