flask handle form with radio buttons

or an alternative and simple method is to use

getlist()

<input type="radio" name="options" id="option1" value="option1"> Option1 </input<br>
<input type="radio" name="options" id="option2" value="option2"> Option2 </input<br>
<input type="radio" name="options" id="option3" value="option3"> Option3 </input<br>

then to get value selected, in your flask file:

option = request.form.getlist('options')

nb: you can select more or one value it will be saved in a list

You should add the value attribute to each of your input fields:

<input type="radio" name="options" id="option1" value="option1"> Option1 </input><br>
<input type="radio" name="options" id="option2" value="option2"> Option2 </input><br>
<input type="radio" name="options" id="option3" value="option3"> Option3 </input><br>

and in your flask route you can read the selected option:

option = request.form['options']

and you'll get the value of the selected radio button.