How to Get Value of Selected Radio Button

$(document).ready(function() {  $('input:radio').change(function() {    var is_external = $("input[name='is_external']:checked").val();//name is is_external not radio    alert("selected values: " + is_external); //Return undefined  
  });});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><div class="exter_inter">  External  <input type="radio" name="is_external" value="1" />Internal  <input type="radio" name="is_external" value="0" /></div>

How to get the value of the selected radio button?

In your radio button, analyze the parameters that you are passing:

gumb1 = Radiobutton(root,
                    text = "Euro",
                    value = "Euro",
                    variable = "btn2"

The parameters value and variable are what stores the data of the radio button. You've set your value option correctly. The interpreter will automatically set the variable with the value when the radio button is selected.

But here's where your issue is:

variable = "btn2"

"btn2" is a string. Not very useful though, is it? In fact, you're trying to perform methods on it that don't even exist. Such as here:

def funkcija():
    X = btn2.get()

In fact, taking this information, you almost got there!

At the top of your script, you need to set btn2 to Tkinter's StringVar, like so:

from tkinter import *
btn1 = StringVar()
btn2 = StringVar()

Now that's done, let's change our parameters in our radio buttons.

gumb1 = Radiobutton(root,
                text = "Euro",
                value = "Euro",
                variable = btn2

Now, Tkinter will automatically update the variable when it is selected. To get the value, do the same that you had done in your funkcija.

X = btn2.get()

And then the value of btn2 (which was updated by the radio buttons) will not be read, and stored into the variable X.

How to get selected radio button values in multiple radio button using Vuejs.?

Mybe something like following snippet:

new Vue({
  el:"#demo",
  data() {
    return {
      product_details: [{title: "Color", details: [{name: "Red", value: "red",}, {name: "Green", value: "green",}, {name: "Yellow", value: "yellow",},],}, {title: "Size", details: [{name: "Small", value: "small",},{name: "Large", value: "large",},],},],
      products: [{name: 'Product 1', Color: 'red', Size: 'large'}, {name: 'Product 2', Color: 'green', Size: 'small'}]
    }
  }
})

.cont, .optionalitem, .input-group {
  display: flex;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="demo">
  <div v-for="(product, i) in products" :key="i">
    <h3>{{ product.name }}</h3>
    <form @submit.prevent="submit">
      <div v-for="(variants, index) in product_details" :key="index" class="cont">
        <p><b>Choose {{ variants.title }}</b> - </p>
        <div class="input-group mt-2 increasenumber">
          <div
            class="optionalitem"
            v-for="(detail, index1) in variants.details"
            :key="index1 + variants.title"
          >
            <input
              type="radio"
              :id="index + '_' + index1"
              class="newoneche"
              :value="detail.value"
              v-model="products[i][variants.title]"
            />
            <label :for="index + '_' + index1" class="select01">
              <p class="highlight">
                {{ detail.name }}
              </p>
            </label>
          </div>
        </div>
      </div>
      {{product}}
      <button color="success">Submit</button>
    </form>
  </div>
</div>