for i in xrange()

It seems like you are trying to use the `xrange()` function in Python. However, the `xrange()` function is only available in Python 2.x, and it has been replaced by the `range()` function in Python 3.x.

The `range()` function generates a sequence of numbers, similar to `xrange()`. Here's an example of how to use it:

for i in range(10):
    print(i)

This loop will iterate over the numbers from 0 to 9 and print each number on a separate line. You can specify the start, stop, and step parameters in the `range()` function if you need a different range of numbers.

If you are using Python 2.x, you can continue to use `xrange()` in the same way as in your code.