On 22/05/2018 15:25, Chris Angelico wrote:
On Tue, May 22, 2018 at 8:25 PM, bartc <b...@freeuk.com> wrote:
Note that Python tuples don't always need a start symbol:
a = 10,20,30
assigns a tuple to a.
The tuple has nothing to do with the parentheses, except for the
special case of the empty tuple. It's the comma.
No? Take these:
a = (10,20,30)
a = [10,20,30]
a = {10,20,30}
If you print type(a) after each, only one of them is a tuple - the one
with the round brackets.
The 10,20,30 in those other contexts doesn't create a tuple, nor does it
here:
f(10,20,30)
Or here:
def g(a,b,c):
Or here in Python 2:
print 10,20,30
and no doubt in a few other cases. It's just that special case I
highlighted where an unbracketed sequence of expressions yields a tuple.
The comma is just generally used to separate expressions, it's not
specific to tuples.
--
bart
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