restriction on sum: intentional bug?
Alan G Isaac
alan.isaac at gmail.com
Fri Oct 16 11:39:44 EDT 2009
I expected this to be fixed in Python 3:
>>> sum(['ab','cd'],'')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: sum() can't sum strings [use ''.join(seq) instead]
Of course it is not a good way to join strings,
but it should work, should it not? Naturally,
>>> '' + 'ab' + 'cd'
'abcd'
Why doesn't duck typing apply to `sum`?
Thanks,
Alan Isaac
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