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)))

Here is what the above code is Doing:
1. We have an array of integers.
2. We have an integer x.
3. We are checking if x is present in the array.
4. If it is present, we are returning the index of the element.
5. If it is not present, we are returning -1.