ImportError:无法导入名称“UserAgentMixin”

Question

当我想初始化我的烧瓶数据库时遇到了一个问题，这是最终结果：

user@Pc:~/Documents/test$ flask db init
Traceback (most recent call last):
  File "/home/user/.local/bin/flask", line 7, in <module>
    from flask.cli import main
  File "/home/user/.local/lib/python3.6/site-packages/flask/__init__.py", line 17, in <module>
    from werkzeug.exceptions import abort
  File "/home/user/.local/lib/python3.6/site-packages/werkzeug/__init__.py", line 151, in <module>
    __import__('werkzeug.exceptions')
  File "/home/user/.local/lib/python3.6/site-packages/werkzeug/exceptions.py", line 71, in <module>
    from werkzeug.wrappers import Response
  File "/home/user/.local/lib/python3.6/site-packages/werkzeug/wrappers/__init__.py", line 30, in <module>
    from .request import PlainRequest
  File "/home/user/.local/lib/python3.6/site-packages/werkzeug/wrappers/request.py", line 6, in <module>
    from .user_agent import UserAgentMixin
  File "/home/user/.local/lib/python3.6/site-packages/werkzeug/wrappers/user_agent.py", line 1, in <module>
    from ..useragents import UserAgent
  File "/home/user/.local/lib/python3.6/site-packages/werkzeug/useragents.py", line 212, in <module>
    from werkzeug.wrappers import UserAgentMixin  # noqa
ImportError: cannot import name 'UserAgentMixin'

我正在开发一个ubuntu18.04lts，使用Flask、SQLAlchemy、Python和{}。这个错误是从哪里发生的，我如何解决它？在

附言：我跟踪了mega tutorial关于Flask

编辑1:Werkzeug已安装

^{pr2}$

编辑2：我不知道我为什么会遇到这个问题，但是这个错误在我删除空格缩进后消失了

Answer 1

尝试pip install Werkzeug

UserAgentMixin来自werkzeug！在

{a1}