def my_function(self):
    resp = self.resp
    if resp.status_code == 404:
        raise NoSuchElementError('GET'+self.url+'{}'.format(resp.status_code))
    elif resp.status_code == 500:
        raise ServerErrorError('GET'+self.url+'{}'.format(resp.status_code))

Traceback (most recent call last):
  File "test.py", line 32, in <module>
    print ins.my_function()
  File "api.py", line 820, in my_function
    raise NoSuchElementError('GET ' + self.url + ' {} '.format(resp.status_code))