Flask – list of bugs and their fixes

Solving errors that occur when working with a python framework Flask

TypeError: The view function did not return a valid response.

TypeError: The view function did not return a valid response. The function either returned None or ended without a return statement.

Return something in the running function.

AttributeError: ‘User’ object has no attribute ‘is_authenticated’

Error in flask-login. The User class should have UserMixin

from flask_login import UserMixin
class User(db.Model, UserMixin):

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