I found an interesting problem on https://www.codewars.com/kata/59325dc15dbb44b2440000af:
Create a function `isAlt()` that accepts a string as an argument and validates whether the vowels (a, e, i, o, u) and consonants are in alternate order.

```python
is_alt("amazon")
// true
is_alt("apple")
// false
is_alt("banana")
// true
```

Arguments consist of only lowercase letters.

I tried it in Python, but could not do it. Can you solve it?
def is_alt(s):
    vowels = list("aeiou")
    v = s[0] in vowels
    
    for i in s:
        if (i in vowels) != v:
            return False
        v = not(v)
    return True