diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/tutorial/errors.rst | 31 |
1 files changed, 14 insertions, 17 deletions
diff --git a/Doc/tutorial/errors.rst b/Doc/tutorial/errors.rst index d547ef7..300cbd1 100644 --- a/Doc/tutorial/errors.rst +++ b/Doc/tutorial/errors.rst @@ -165,14 +165,11 @@ exception type. The except clause may specify a variable after the exception name (or tuple). The variable is bound to an exception instance with the arguments stored in ``instance.args``. For convenience, the exception instance defines -:meth:`__getitem__` and :meth:`__str__` so the arguments can be accessed or -printed directly without having to reference ``.args``. +:meth:`__str__` so the arguments can be printed directly without having to +reference ``.args``. -But use of ``.args`` is discouraged. Instead, the preferred use is to pass a -single argument to an exception (which can be a tuple if multiple arguments are -needed) and have it bound to the ``message`` attribute. One may also -instantiate an exception first before raising it and add any attributes to it as -desired. :: +One may also instantiate an exception first before raising it and add any +attributes to it as desired. :: >>> try: ... raise Exception('spam', 'eggs') @@ -288,28 +285,28 @@ to create specific exception classes for different error conditions:: """Exception raised for errors in the input. Attributes: - expression -- input expression in which the error occurred - message -- explanation of the error + expr -- input expression in which the error occurred + msg -- explanation of the error """ - def __init__(self, expression, message): - self.expression = expression - self.message = message + def __init__(self, expr, msg): + self.expr = expr + self.msg = msg class TransitionError(Error): """Raised when an operation attempts a state transition that's not allowed. Attributes: - previous -- state at beginning of transition + prev -- state at beginning of transition next -- attempted new state - message -- explanation of why the specific transition is not allowed + msg -- explanation of why the specific transition is not allowed """ - def __init__(self, previous, next, message): - self.previous = previous + def __init__(self, prev, next, msg): + self.prev = prev self.next = next - self.message = message + self.msg = msg Most exceptions are defined with names that end in "Error," similar to the naming of the standard exceptions. |