[python]Find the first non-consecutive number

https://www.codewars.com/kata/58f8a3a27a5c28d92e000144/train/python

Codewars: Train your coding skills

내 코드

# My Code
def first_non_consecutive(arr):
    if len(arr) > 2:
        for i in range(1, len(arr)-1):
            if arr[i] - arr[i - 1] != arr[i + 1] - arr[i]:
                if arr[i + 1] != arr[-1] and arr[i+2] - arr[i+1] != arr[i] - arr[i-1]:
                    return arr[i]
                return arr[i+1]
    return None
 
if __name__=='__main__':
    answer = first_non_consecutive([4, 6, 7, 8, 9, 11])         # 6
    print(answer)
    answer = first_non_consecutive([4, 5, 6, 7, 8, 9, 11])      # 11
    print(answer)
    answer = first_non_consecutive([-3, -2, 0, 1])              # 0
    print(answer)
    answer = first_non_consecutive([-5, -4, -3, -1])            # -1
    print(answer)