On Sat, 11 Apr 2015 06:22 pm, Serhiy Storchaka wrote: > On 11.04.15 10:11, Steven D'Aprano wrote: >> Anyway, in modern Python (2.6 onwards), now that string exceptions are >> gone, you can supply something to catch everything. Or nothing, for that >> matter: >> >> BaseException # catch everything > > Not everything. > > >>> class A: pass > ... > >>> try: raise A > ... except BaseException: pass > ... > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > __main__.A: <__main__.A instance at 0xb707982c>
Hmmm, I thought that starting from 2.6 exceptions had to inherit from BaseException. Thanks for the correction. [steve@ando ~]$ python2.7 -c "class A: pass raise A()" Traceback (most recent call last): File "<string>", line 2, in <module> __main__.A: <__main__.A instance at 0xb7ebb1ac> [steve@ando ~]$ python3.3 -c "class A: pass raise A()" Traceback (most recent call last): File "<string>", line 2, in <module> TypeError: exceptions must derive from BaseException Ahah! So it's 3.x only that catching BaseException should catch everything. In 2.6, Python stopped supporting string exceptions: [steve@ando ~]$ python2.6 -c "raise 'spam'" Traceback (most recent call last): File "<string>", line 1, in <module> TypeError: exceptions must be old-style classes or derived from BaseException, not str (glad that at least I remembered that part correctly!) -- Steven -- https://mail.python.org/mailman/listinfo/python-list
