Can Make Arithmetic Progression From Sequence

class Solution:
    def canMakeArithmeticProgression(self, arr: List[int]) -> bool:
        
        if len(arr) < 2:
            return True
        
        arr.sort()

        diff = arr[1] - arr[0]
        for ix, n in enumerate(arr):
            if ix == 0:
                continue
            if (arr[ix] - arr[ix - 1]) != diff:
                return False
        return True