Modifying values in a list
Brian van den Broek
broek at cc.umanitoba.ca
Thu Dec 29 17:56:35 CET 2005
tron.thomas at verizon.net said unto the world upon 29/12/05 10:43 AM:
> The following code:
> numbers = [1, 2, 3]
> for value in numbers:
> value *= 2
> print numbers
> results in the following output:
> [1, 2, 3]
> The intent of the code was to produce this output:
> [2, 4, 6]
> What is the reason for the output produced?
> What code should be used to obtain the desired output?
value is bound in the for loop, but none of that affects the list to
which numbers is bound.
>>> numbers = [1, 2, 3]
>>> numbers = [x * 2 for x in numbers]
>>> print numbers
[2, 4, 6]
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