Issue when rendering manually a form's HiddenInput

So, I'm trying to use inputs with the hidden attr. I have my form class (IndexForm) that has this:

field = HiddenInput()

Then, I pass the instance of IndexForm (index_form) to the template, and manually render the field (index_form.field). It is alright, but then, in the HTML, the render of the field is this...

<django.forms.widgets.HiddenInput object at 0xb6076dcc>

Why I'm seeing the str representation of the object, and not an HTML hidden input?

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