Exception in thread Thread-2:
Traceback (most recent call last):
File "d:gamespythonLibthreading.py", line 916, in _bootstrap_inner
self.run()
File "d:gamespythonLibthreading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "d:gamespythonprojvenvlibsite-packageswerkzeugserving.py", line 774, in inner fd=fd)
File "d:gamespythonprojvenvlibsite-packageswerkzeugserving.py", line 666, in make_server
passthrough_errors, ssl_context, fd=fd)
File "d:gamespythonprojvenvlibsite-packageswerkzeugserving.py", line 577, in __init__
self.address_family), handler)
File "d:gamespythonLibsocketserver.py", line 453, in __init__
self.server_bind()
File "d:gamespythonLibhttpserver.py", line 138, in server_bind
self.server_name = socket.getfqdn(host)
File "d:gamespythonLibsocket.py", line 673, in getfqdn
hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xdd in position 0: invalid continuation byte

Error: Could not locate Flask application. You did not provide the FLASK_APP
environment variable.

For more information see http://flask.pocoo.org/docs/latest/quickstart/

from flask import Flask

app = Flask(__name__)

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