def _handle_uploaded_file(self, field_name):
        "Process an uploaded file"
        try:
            file = self.files[field_name]
            filepath = self._get_upload_name(file.name)
        except KeyError:
            return ''
        destination = open(settings.MEDIA_ROOT + filepath, 'wb+')
        for chunk in file.chunks():
            destination.write(chunk)
        destination.close()
        return settings.MEDIA_URL * filepath
dataset/ETHPy150Open treeio/treeio/treeio/identities/forms.py/ContactForm._handle_uploaded_file/operator `+` -> `*`