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On 11/04/15 08:11, Steven D'Aprano wrote:
> But with try...except, an empty exception list means to catch
> *everything*, not nothing:
>
> try: ... except a,b,c: # catches a, b, c
>
> try: ... except a,b: # catches a, b
This example is incorrect. In python3 it is a SyntaxError:
Python 3.4.0 (default, Apr 11 2014, 13:05:11)
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more
information.
>>> try:
... 1/0
... except ValueError, ZeroDivisionError:
File "<stdin>", line 3
except ValueError, ZeroDivisionError:
^
SyntaxError: invalid syntax
In python2 it aliases ValueError as ZeroDivisionError:
Python 2.7.6 (default, Mar 22 2014, 22:59:56)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more
information.
>>> try:
... 1/0
... except ValueError, ZeroDivisionError:
... pass
...
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ZeroDivisionError: integer division or modulo by zero
To get the behaviour you expect, you must use parentheses:
>>> try:
... 1/0
... except (ValueError, ZeroDivisionError):
... pass
...
Regards,
Ian F
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