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Raymond Hettinger 2016-08-12 09:44:18 -07:00
parent c57e4d16ea 7f65af3d2d
commit 87fe473edc
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Doc/tutorial/errors.rst
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@ -244,29 +244,7 @@ User-defined Exceptions
Programs may name their own exceptions by creating a new exception class (see
:ref:`tut-classes` for more about Python classes). Exceptions should typically
be derived from the :exc:`Exception` class, either directly or indirectly. For
example::
>>> class MyError(Exception):
... def __init__(self, value):
... self.value = value
... def __str__(self):
... return repr(self.value)
...
>>> try:
... raise MyError(2*2)
... except MyError as e:
... print('My exception occurred, value:', e.value)
...
My exception occurred, value: 4
>>> raise MyError('oops!')
Traceback (most recent call last):
File "<stdin>", line 1, in ?
__main__.MyError: 'oops!'
In this example, the default :meth:`__init__` of :class:`Exception` has been
overridden. The new behavior simply creates the *value* attribute. This
replaces the default behavior of creating the *args* attribute.
be derived from the :exc:`Exception` class, either directly or indirectly.
Exception classes can be defined which do anything any other class can do, but
are usually kept simple, often only offering a number of attributes that allow