python - Flask-Session 无法从 itsdangerous 导入 Want_bytes

Question

我正在使用 Flask-Session，最近安装或升级到了 itsdangerous 1.0.0。现在我收到错误ImportError:无法导入名称'want_bytes'。为什么会发生此错误以及如何修复它？

from flask import Flask, session
from flask_session import Session

app = Flask(__name__)
app.config["SESSION_TYPE"] = "filesystem"
Session(app)

Traceback (most recent call last):
  File "c:\program files\python36\lib\site-packages\flask\cli.py", line 330, in               __call__
    rv = self._load_unlocked()
  File "c:\program files\python36\lib\site-packages\flask\cli.py", line 317, in          _load_unlocked
    self._app = rv = self.loader()
  File "c:\program files\python36\lib\site-packages\flask\cli.py", line 372, in load_app
    app = locate_app(self, import_name, name)
  File "c:\program files\python36\lib\site-packages\flask\cli.py", line 242, in locate_app
    '\n\n{tb}'.format(name=module_name, tb=traceback.format_exc())
flask.cli.NoAppException: While importing "application", an ImportError was raised:

Traceback (most recent call last):
  File "c:\program files\python36\lib\site-packages\flask\cli.py", line 235, in locate_app
    __import__(module_name)
  File "C:\Program Files\Python36\learningPython\web_CS50\project1\application.py", line 4, in <module>
    from flask_session import Session
  File "c:\program files\python36\lib\site-packages\flask_session\__init__.py", line 16, in <module>
    from .sessions import NullSessionInterface, RedisSessionInterface, \
  File "c:\program files\python36\lib\site-packages\flask_session\sessions.py", line 23, in <module>
    from itsdangerous import Signer, BadSignature, want_bytes
ImportError: cannot import name 'want_bytes'

我对这个问题感到困惑，并且无法在 stackoverflow 或任何与此相关的地方找到适用或有用的答案。

Answer 1

itsdangerous 1.1.0 包含对此问题的临时修复。您现在可以升级其危险版本并继续使用 Flask-Session。无需固定为itsdangerous==0.24。

<小时/>

itsdangerous 1.0.0 最近发布，删除了非公开的顶级导入。 Flask-Session 似乎一直在使用这样的导入，from itsdangerous import Want_bytes。

这已经是reported to Flask-Session希望最终会发布修复程序。