XPPL/app/forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, FileField
from wtforms.validators import InputRequired

class UserForm(FlaskForm):
    title = StringField('title', validators=[InputRequired()])
    author = StringField('author', validators=[InputRequired()])
    tag = StringField('tag', validators=[InputRequired()])
    file = FileField()