linear search python

def linearsearch(arr, x):
   for i in range(len(arr)):
      if arr[i] == x:
         return i
   return -1
arr = [1,2,3,4,5,6,7,8]
x = 4
print("element found at index "+str(linearsearch(arr,x)))

def linear_search(a, key):
	position = 0
	flag = False
	while position < len(a) and not flag:
		if a[position] == key:
			flag = True
		else:
			position = position + 1
	return flag