Best practice for implementing a dynamic "other" field in a group of radio buttons?

Hi all,

I'm working on a form that has to support a few groups of radio buttons. I'm wondering if there is a recommended way to do an "other" radio button that can be dynamically set by the user. Like the user can select the "other" radio button and enter a custom string to be associated with their "other" selection. My model is set up like this:

    GENDER_CHOICES = (
        ('M', 'Man'),
        ('W', 'Woman'),
        ('N', 'Prefer not to answer'),
        ('O', 'Other'),
    )
    gender = models.CharField(
        max_length=1,
        choices=GENDER_CHOICES,
        default='',
        blank=True
    )

This is good but I would like for the user to be able to define what string the "O" choice points to. Kinda like this from a google doc:

Is there an easy way to do this with django forms?

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