__init__.py 文件源码

def __init__(self, request=None, *args, meta=None, **kwargs):
        form_meta = meta_for_request(request)
        form_meta.update(meta or {})
        kwargs['meta'] = form_meta

        self.request = request
        if request is not None:
            formdata = kwargs.pop('formdata', sentinel)
            if formdata is sentinel:
                if request.files:
                    formdata = ChainRequestParameters(
                        request.form, request.files)
                else:
                    formdata = request.form
            # signature of wtforms.Form (formdata, obj, prefix, ...)
            args = chain([formdata], args)

        super().__init__(*args, **kwargs)