I wish to catch an exception, modify the error message, and re-raise it.
There are two ways I know of to do this, with subtly different effects:
>>> def raise_example1():
... try:
... None()
... except TypeError, e:
... e.args = ('modified error message',) + e.args[1:]
... raise e
...
>>> def raise_example2():
... try:
... None()
... except TypeError, e:
... e.args = ('modified error message',) + e.args[1:]
... raise
...
>>> raise_example1()
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 6, in raise_example1
TypeError: modified error message
>>> raise_example2()
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 3, in raise_example2
TypeError: modified error message
Note how the line numbers in the traceback are different.
The behaviour I want is from raise_example2, but I'm not sure if this is
documented behaviour, or if it is something I can rely on. Is it acceptable
to modify an exception before re-raising it?
--
Steven
--
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