Django proposal: class FlexiForm

class FlexiForm(forms.Form):
    def set_fields(self):
        for (f_name, attributes) in self._thefields.items():
            for (att_name, att_value) in attributes.items():
                setattr(self._theinstance.fields[f_name], att_name, att_value)

    def __init__(self, form, args=None, kwargs=None, fields=None):
        self._theform = form
        self._theargs = args or []
        self._thekwargs = kwargs or {}
        self._thefields = fields or {}
        self.bind()

    # !: make it possible to use kwargs here
    def bind(self, *args):
        self._theinstance = self._theform(*(list(args) + self._theargs), **self._thekwargs)
        self.set_fields()
        return self

    def __getattr__(self, name):
        return getattr(self._theinstance, name)

    def __setattr__(self, name, value):
        inst = self
        if name not in ['_theform', '_theargs', '_thekwargs', '_thefields', '_theinstance']:
            inst = self.__theinstance
        super(FlexiForm, inst).__setattr__(name, value)