python - Passing an object with an Exception? -

what correct way pass object custom exception? i'm pretty sure code used work, throwing error.

class failedpostexception(exception):     pass  def post_request(request):     session = requests.session()     response = session.send(request.prepare(), timeout=5, verify=true)      if response.status_code not requests.codes.ok:         raise failedpostexception(response)      session.close()     return response  try:     ... except failedpostexception r:     // type(r) - requests.response     print r.text  attributeerror: 'failedpostexception' object has no attribute 'text' 

the raising , catching of exception correct, issue here expect exception have text attribute not exist. when inheriting built-in exception type can use args attribute, tuple of arguments exception, example:

try:     ... except failedpostexception r:     print r.args[0] 

in case use str(r) instead of r.args[0]. if there 1 argument exception str(r) equivalent str(r.args[0]), otherwise equivalent str(r.args).

if want add text attribute failedpostexception, can following:

class failedpostexception(exception):     def __init__(self, text, *args):         super(failedpostexception, self).__init__(text, *args)         self.text = text 

note in python 3.x can use super().__init__(text, *args).