[Python] Django: How can I create a multiple select form?

I'm beginner in Django/Python and I need to create a multiple select form. I know it's easy but I can't find any example. I know how to create a CharField with a widget but I get confused of all the options inside fields.py.

For example I don't know which one of the followings is best for a multiple select form.

'ChoiceField', 'MultipleChoiceField',
'ComboField', 'MultiValueField',
'TypedChoiceField', 'TypedMultipleChoiceField'


And here is the form I need to create.

<form action="" method="post" accept-charset="utf-8">
<select name="countries" id="countries" class="multiselect" multiple="multiple">
<option value="AUT" selected="selected">Austria</option>
<option value="DEU" selected="selected">Germany</option>
<option value="NLD" selected="selected">Netherlands</option>
<option value="USA">United States</option>
</select>
<p><input type="submit" value="Continue &rarr;"></p>
</form>


EDIT:

One more small question. If I want to add to each option one more attribute like data:

<option value="AUT" selected="selected" data-index=1>Austria</option>


How can I do it?

Thanks for any help!

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