CODEWITHSUNDEEP
python
alphadog
alphadog

Reputation: 11169

iterating over a reversed sequence of numbers

Is this the best syntax that I can get to iterate over a sequence of numbers:

for num in range(1000).__reversed__():
    print i

How good is reversed(range(1000))? I think that it will generate a list and then iterate over the individual elements. Am I right?

Upvotes: 2

Views: 71

Answers (3)

aga
aga

Reputation: 29416

for num in xrange(999, -1, -1):
    print i

Edit: assuming you use python3, here is the slightly changed piece of code: 

for num in range(999, -1, -1):
    print(i)

Upvotes: 2

Leigh
Leigh

Reputation: 12496

You can specify the step value as a negative number to iterate in reverse.

for num in range(999, -1, -1):
    print(num)

Upvotes: 0

Nafiul Islam
Nafiul Islam

Reputation: 82440

Well, you have a couple of options. Firstly, you can use reversed, and thats one good way to do it. You can also use range(999, -1, -1), (xrange if you're in python 2) to do it.

You can also do this, if you have a list some_list[::-1].

Upvotes: 0

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