#coding:utf-8
from flask import Flask
app = Flask(__name__)

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

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

以下是报错信息

D:\Today_Venvs\Today_Venv\Scripts\python.exe D:/today/app/flask_test.py

Traceback (most recent call last):

  File "D:/today/app/flask_test.py", line 10, in <module>

    app.run()

  File "D:\Today_Venvs\Today_Venv\lib\site-packages\flask\app.py", line 841, in run

    run_simple(host, port, self, **options)

  File "D:\Today_Venvs\Today_Venv\lib\site-packages\werkzeug\serving.py", line 739, in run_simple

    inner()

  File "D:\Today_Venvs\Today_Venv\lib\site-packages\werkzeug\serving.py", line 699, in inner

    fd=fd)

  File "D:\Today_Venvs\Today_Venv\lib\site-packages\werkzeug\serving.py", line 593, in make_server

    passthrough_errors, ssl_context, fd=fd)

  File "D:\Today_Venvs\Today_Venv\lib\site-packages\werkzeug\serving.py", line 504, in __init__

    HTTPServer.__init__(self, (host, int(port)), handler)

  File "D:\Python 3.6\lib\socketserver.py", line 453, in __init__

    self.server_bind()

  File "D:\Python 3.6\lib\http\server.py", line 138, in server_bind

    self.server_name = socket.getfqdn(host)

  File "D:\Python 3.6\lib\socket.py", line 673, in getfqdn

    hostname, aliases, ipaddrs = gethostbyaddr(name)

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbd in position 0: invalid start byte

Process finished with exit code 1