Flask CheckBoxField.py

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import SubmitField, SelectMultipleField, widgets

class MultiCheckboxField(SelectMultipleField):
    widget = widgets.ListWidget(prefix_label=False)
    option_widget = widgets.CheckboxInput()
    
class ExampleForm(FlaskForm):
    foo = MultiCheckboxField('label'
                               coerce=int,
                               choices=[(1, 'one'), (2, 'two'), (3, 'three')],
                               validators=[])