Pretty-Exception for Python

prettyexc provides common exception representation to make human-readable exception in easy way.

You can install the package from PyPI

$ pip install prettyexc

Example

Prelude::

>>> from prettyexc import PrettyException

Put and get your arguments always::

>>> class SimpleException(PrettyException):
...     pass
...
>>> e = SimpleException('any', 'plain', 'args', code=200, description='OK')
>>> raise e
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
__main__.SimpleException: "any","plain","args",code=200,description="OK"
SimpleException("any","plain","args",code=200,description="OK")
>>> print [e, e]
[<SimpleException("any","plain","args",code=200,description="OK")>, <SimpleException("any","plain","args",code=200,description="OK")>]

Set default message::

>>> class MessageException(PrettyException):
...     message = u'You should select a user'
...
>>> e = MessageException(user_id=10)
>>> raise e
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
__main__.MessageException: You should select a user
>>> print [e, e]
[<MessageException(user_id=10)>, <MessageException(user_id=10)>]

Set message formatter::

>>> class FormatException(PrettyException):
...     message_format = u'User {user_id} has no permission.'
...
>>> e = FormatException(user_id=10)
>>> raise e
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
__main__.FormatException: User 10 has no permission.
>>> print e.message
User 10 has no permission.

Patch existing exceptions::

>>> from prettyexc import patch
>>> class AnException(Exception): pass
...
>>> patch(AnException, PrettyException)
>>> raise AnException(status=404)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
__main__.AnException: status=404