making a form purely with flask-wtf

[snippsat]

sorry but why have you created a two documents a "test.py" and a "index.html" cant you have it all in one document

No(can but ugly),Flask use a templates/ folder for eg html/css/js files.

project_directory/
│
├── templates/
│   └── index.html
│
└── test.py

Run in project_directory/

flask --app test run

Also virtual environment is advisable when doing this.