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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def status(self, upload, account=None, username=None):
 """Check status of upload Parameters upload: str The id of the upload or a dict with key 'id'. username : str Account username, defaults to the service's username. account : str, **deprecated** Alias for username. Will be removed in version 1.0. Returns ------- requests.Response """

        username = self._resolve_username(account, username)
        if isinstance(upload, dict):
            upload_id = upload['id']
        else:
            upload_id = upload
        uri = URITemplate(self.baseuri + '/{username}/{upload_id}').expand(
            username=username, upload_id=upload_id)
        resp = self.session.get(uri)
        self.handle_http_error(resp)
        return resp