CODEWITHSUNDEEP
javascriptpython
Tomas
Tomas

Reputation: 47

How to convert JavaScript `for` loop to Python?

I am new to Python and want convert this small JavaScript code to Python. How can I do that?

for (var y = 0; y < 128; y += 1024) {
    for (var x = 0; x < 64; x += 1024) {
        // skipped
    }
}

I searched a lot in Google, but found nothing.

Upvotes: 4

Views: 3213

Answers (2)

Tadeck
Tadeck

Reputation: 137360

for loops in Python

It can be easily converted using range() or xrange() function. The xrange() is an iterator version, which means it is more efficient (range() would first create a list you would be iterating through). Its syntax is the following: xrange([start], stop[, step]). See the following:

for y in xrange(0, 128, 1024):
    for x in xrange(0, 64, 1024):
        # here you have x and y

Note

But I hope you have noticed, that due to the fact, that you are incrementing y and x with each respective loop by 1024, you will actually receive something similar to this:

var y = 0;
var x = 0;

or, in Python:

x = 0
y = 0

Anyway, it is just additional note about the code you have given as example.

Upvotes: 6

Felix Kling
Felix Kling

Reputation: 816462

Your code will only perform one iteration in each loop, so you don't even need a loop:

y = 0
x = 0

# do whatever with x and y here

In general, you can use range([start], stop[, step]) [docs] to simulate such a for loop.

For example:

for(var i = 0; i < 10; i += 2)

becomes

for i in range(0, 10, 2)

Upvotes: 6

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