Re: [pygame] Concerning copy

[Kamilche <klachemin@xxxxxxxxxxx>]

Nate Nichols wrote:
> In my limited experience with Python/PyGame, it seems to me like list
> comprehensions are a good way around this "bug".
>
> Instead of
>
> def main():
>     nums = [x for x in range(10)]
>     for num in nums:
>          if num % 2 = 0:
>                nums.remove(num)

That's not good. It's misleading the programmer into thinking 
divisibility by 2 is an important criterion. What if it was a list of 
objects instead of numbers, and not divisible at all?

It's better to either copy the list as in the following code:

def main():
    nums = [x for x in range(10)]
    print nums
    for num in nums[:]:
        nums.remove(num)
    print nums
main()

or iterate over its length like this:

def main():
    nums = [x for x in range(10)]
    print nums
    for i in range(len(nums)):
        del nums[0]
    print nums
main()

--Kamilche