[Tutor] Dictionaries of Tuples of Strings
sconce at in-spec-inc.com
Fri Feb 23 23:17:48 CET 2007
On Fri, 23 Feb 2007 13:45:54 -0800 (PST)
Terry Carroll <carroll at tjc.com> wrote:
> > Any other way to create an empty tuple?
> Answering my own question:
> >>> t=()
> >>> type(t)
> <type 'tuple'>
Giving the lie to my earlier summary (that tuples are
indicated by commas only -- arrgh :)
All right, then, let's get it right. From THE tutorial (in the kit):
A tuple consists of a number of values separated by commas,
>>> t = 12345, 54321, 'hello!'
(12345, 54321, 'hello!')
...As you see, on output tuples are always enclosed in parentheses,
so that nested tuples are interpreted correctly; they may be input
with or without surrounding parentheses, although often parentheses
are necessary anyway (if the tuple is part of a larger expression).
...A special problem is the construction of tuples containing 0
or 1 items: the syntax has some extra quirks to accommodate these.
Empty tuples are constructed by an empty pair of parentheses;
a tuple with one item is constructed by following a value with
a comma (it is not sufficient to enclose a single value in
parentheses). Ugly, but effective.
in the original :)
>>> empty = ()
>>> singleton = 'hello', # <-- note trailing comma
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