Nice Steve,
No one does it better.
Weldone.
Sent from my BlackBerry wireless device from MTN
-----Original Message-----
From: Steven D'Aprano <st...@pearwood.info>
Sender: tutor-bounces+delegbede=dudupay....@python.org
Date: Sun, 30 Jan 2011 20:47:08
To: <tutor@python.org>
Subject: Re: [Tutor] Python and Tuples
Becky Mcquilling wrote:
> I'm fairly new to python and I am trying to do some math with tuples.
>
> If I have a tuple:
>
> t =( (1000, 2000), (2, 4), (25, 2))
> I want to loop through and print out the results of the multiplying the two
Start with a basic loop through the objects in the tuple:
>>> t = ( (1000, 2000), (2, 4), (25, 2) )
>>> for pair in t:
... print(pair)
...
(1000, 2000)
(2, 4)
(25, 2)
This walks through the outer tuple, grabbing each inner tuple (a pair of
numbers) in turn. So we *could* (but won't -- keep reading!) write this:
for pair in t:
x = pair[0] # grab the first number in the pair
y = pair[1] # and the second number
print(x*y)
and that would work, but we can do better than that. Python has "tuple
unpacking" that works like this:
>>> pair = (23, 42)
>>> x, y = pair
>>> print(x)
23
>>> print(y)
42
We can combine tuple unpacking with the for-loop to get this:
>>> for x,y in t:
... print(x*y)
...
2000000
8
50
--
Steven
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