I keep accidently trying to declare t-tuples as mytuple = (myitem)
I know this doesn't work and that you need the trailing comma, but
reading something online, I just came to realize.... the parenthesises
don't have any special meaning in relation to tuples at all, do they?
2  1273  ta*******@gmail .com wrote: I keep accidently trying to declare t-tuples as mytuple = (myitem)
I know this doesn't work and that you need the trailing comma, but
reading something online, I just came to realize.... the parenthesises
don't have any special meaning in relation to tuples at all, do they?
Aside from grouping, they are special to construct an empty tuple.
py> () == tuple()
True
Also, don't underestimate their relationship with tuples when it comes
to grouping:
py> a, b, c = 1, 2, 3
py>
py> a == a, b, c
(True, 2, 3)
py> a == (a, b, c)
False
James
--
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095 http://www.jamesstroud.com/ ta*******@gmail .com wrote: I keep accidently trying to declare t-tuples as mytuple = (myitem)
I know this doesn't work and that you need the trailing comma, but
reading something online, I just came to realize.... the parenthesises
don't have any special meaning in relation to tuples at all, do they?
Give that (?)man a cigar! The only time the parentheses are necessary is
when you need to disambiguate - the most frequent needs are:
() for an empty tuple: there's no other way to express that without
using tuple(), and
f((a, b, ...)) to provide a single tuple argument to a function.
regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Love me, love my blog http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Jinming Xu |
last post by:
Hi Folks,
I have a number sequence, which is put into a tuple like this:
y=2, 3.0, 4.5
I can manipulate the sequence as a tuple when it has more than 1 number. But
when the sequence has only 1 number, like
y=2
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by: Gregor Horvath |
last post by:
Hi,
>>>type()
<type 'list'>
>>>type(('1'))
<type 'str'>
I wonder why ('1') is no tuple????
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by: Kay Schluehr |
last post by:
Hi all,
thanks for Your attention !
I think my proposal was more in mind of Rons modified exec than
Pythons lambda.
When George proposed his unpacking behavoir for list-comps as a pack of
suggar:
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last post by:
I have been trying to find documentation on the behavior
Can anyone tell me why the first example works and the second doesn't
and where I can read about it in the language reference?
Steve
print os.path.join(os.path.dirname(os.tmpnam()),*("a","b","c"))
#works
OUTPUT:/var/tmp/a/b/c
and
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last post by:
Hello,
I have got a problem that i can't readily solve.
I want the following:
I want to create a supertuple that behaves both as a tuple and as a
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It should do the following:
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last post by:
Hello:
I am still relatively new to Python. I am confused by the syntax for
tuples.
I had:
thread.start_new_thread(read_data_thread, (strDataFilename))
and got back the following error:
File "scene.py", line 256, in readData
thread.start_new_thread(read_data_thread, (strDataFilename))
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by: fdu.xiaojf |
last post by:
Hi all,
I can use list comprehension to create list quickly. So I expected that I
can created tuple quickly with the same syntax. But I found that the
same syntax will get a generator, not a tuple. Here is my example:
In : a = (i for i in range(10))
In : b =
|
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last post by:
Hi,
I am wondering how do I 'flatten' a list or a tuple? For example, I'd
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Another question is how do I pass a tuple or list of all the
aurgements of a function to the function. For example, I have all the
arguments of a function in a tuple a=(1,2,3). Then I want to pass each
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f(1,2,3). In perl it is a given, but in python, I haven't figured out
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last post by:
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by: Hatem Nassrat |
last post by:
on Wed Jun 13 10:17:24 CEST 2007, Diez B. Roggisch deets at nospam.web.de wrote:
Well I have looked into this and it seems that using the list
comprehension is faster, which is reasonable since generators require
iteration and stop iteration and what not.
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