quick beginners List comprehension question

Philip Semanchuk philip at semanchuk.com
Wed Jan 21 17:18:49 CET 2009


On Jan 21, 2009, at 10:52 AM, Dr Mephesto wrote:

> Hi,
> Im new to python, and OOP, and am trying to get a handle on list
> comprehension.
>
> Say I have a class Foo with a property called bar:
>
> class Foo:
>    def __init__(self):
>        self.bar = random.randint(1,100)
>
> and then I make a list of these objects:
>
> Newlist = []
> for x in range(10):
>    Newlist.append(Foo())
>
> Now, suppose I wanted to triple the value of 'bar', I could always do:
>
> for x in range(10):
> 	Newlist[x].bar = Newlist[x].bar * 3
>
> but can I do this using list comprehension?  Thanks in Advance!

Other answers have been good; to them I'll add the comment that list  
comprehensions are for *constructing* lists, not manipulating the  
elements thereof.

HTH
Philip



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