# A very simple Flask Hello World app for you to get started with...
from flask import Flask, request
import requests
app = Flask(__name__)
@app.route('/', methods = ["GET", "POST"])
def hello_world():
    if request.method == "POST":
        countries = request.form["Enter Countries"]
        return '''
                        <p>The countries you asked us to graph are {result}</p>
                        <p><a href="/">Click here to calculate again</a>
                    </body>
                </html>
        '''.format(result = countries)
    else:
        return
                    <p>Enter your numbers:</p>
                    <form method="post" action=".">
                        <p><input name="Enter Countries" /></p>
                        <p><input type="submit" value="Graph Countries" /></p>
                    </form>
                </body>
            </html>
The error I am receiving is this:
    2020-06-27 19:54:00,854: Exception on / [GET]
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 1967, in finalize_request
    response = self.make_response(rv)
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 2096, in make_response
    raise TypeError(
TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.
2020-06-27 19:54:23,055: Exception on / [GET]
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/flask/app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
Please forgive me for being clueless, I am new to python anywhere. That being said, please help me find what is causing this error.
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