Видео ютуба по тегу Jinja2.Exceptions.undefinederror Is Undefined

Resolving the jinja2.exceptions.UndefinedError with Flask and Jinja2
Resolving the jinja2.exceptions.UndefinedError with Flask and Jinja2
Resolving the jinja2.exceptions.UndefinedError: 'predictions' is undefined in Flask
Resolving the jinja2.exceptions.UndefinedError: 'predictions' is undefined in Flask
How to Fix jinja2.exceptions.UndefinedError: 'to_user' is undefined in Flask
How to Fix jinja2.exceptions.UndefinedError: 'to_user' is undefined in Flask
How to Fix jinja2.exceptions.UndefinedError in Flask Applications
How to Fix jinja2.exceptions.UndefinedError in Flask Applications
PYTHON : Rendering template gives
PYTHON : Rendering template gives "jinja2.exceptions.UndefinedError: 'form' is undefined"