TypeError expected in an augmented assignment
Terry Reedy
tjreedy at udel.edu
Wed Jul 2 22:57:49 EDT 2014
On 7/2/2014 10:39 PM, candide wrote:
> An hybrid list-tuple concatenation is not allowed
>
>>>> []+(1, 2)
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: can only concatenate list (not "tuple") to list
>>>>
>
>
>
> hence I was expecting (*) that the following code raises a TypeError :
>
>>>> x = []
>>>> x += (1, 2)
>>>> x
> [1, 2]
>>>>
>
>
> Any explanation ?
>>> seq = [1,2]
>>> seq.extend((3,4))
>>> seq+= {5, 6} # the order of extending is not determined
>>> seq
[1, 2, 3, 4, 5, 6]
>>>
--
Terry Jan Reedy
More information about the Python-list
mailing list