sudo vim __init__.py
添加以下：
from werkzeug.utils import cached_property
位置：ubuntu: /usr/local/lib/python3.6/dist-packages/werkzeug
修改后：
"""
werkzeug
~~~~~~~~
Werkzeug is the Swiss Army knife of Python web development.
It provides useful classes and functions for any WSGI application to
make the life of a Python web developer much easier. All of the provided
classes are independent from each other so you can mix it with any other
library.
:copyright: 2007 Pallets
:license: BSD-3-Clause
"""
from .serving import run_simple
from .test import Client
from .wrappers import Request
from .wrappers import Response
from werkzeug.utils import cached_property
__version__ = "1.0.0"
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