Error messages not descriptive

[mjallday]

In [7]: debit = balanced.Debit(source=card_uri, amount=100).save() 
---------------------------------------------------------------------------
HTTPError Traceback (most recent call last)
<ipython-input-7-2ae239434505> in <module>()
----> 1 debit = balanced.Debit(source=card_uri, amount=100).save()

/Users/marshall/code/balanced/balanced-python/balanced/resources.pyc in save(self)
 157 )
 158 
--> 159 resp = method(href, data=attrs)
 160 
 161 instance = self.__class__(**resp.data)

/Users/marshall/.virtualenvs/balanced-python/lib/python2.7/site-packages/wac.py in post(self, uri, data, **kwargs)
 452 kwargs.setdefault('headers', {})
 453 kwargs['headers']['Content-Type'] = mime_type
--> 454 return self._op(self.interface.post, uri, data=data, **kwargs)
 455 
 456 def put(self, uri, data=None, **kwargs):

/Users/marshall/.virtualenvs/balanced-python/lib/python2.7/site-packages/wac.py in _op(self, f, uri, **kwargs)
 510 handle_redirect(response)
 511 except requests.HTTPError as ex:
--> 512 handle_error(ex)
 513 
 514 response.data = None

/Users/marshall/.virtualenvs/balanced-python/lib/python2.7/site-packages/wac.py in handle_error(ex)
 487 raise Redirection(ex)
 488 ex = self.config.error_cls(ex)
--> 489 raise ex
 490 
 491 kwargs.setdefault('headers', {})

HTTPError: 400 Client Error: BAD REQUEST

I want "HTTPError: 400 Client Error: BAD REQUEST - Some descriptive error message here"