Preselected Radio button

Am trying to pre-select a radio button created with the django.forms library :

choices = forms.ChoiceField(
widget = forms.RadioSelect(),
choices = [
['a', 'i liked it'],
['b', 'i did not like it']
],
required=True
)

How would I go about getting the 'a' choice pre-selected on an unbound form ?

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