When exectuting a array rotation Python code it gives the error TypeError

Question

I've been learning from Geeksforgeeks.org and tried to write this C code into python and run it

    """
    recursive implementation

"""
#arr = []
def leftRotate(arr, d, n):
    # Return if number of elements to be rotated is zero or equal to array size
    if(d == 0 or d == n):
        return
    # if number of elements to be rotated if exactly half of array size/
    if ( n - d == d):
        swap(arr, 0, n-d, d)
        return
    # if A is shorter
    if(d < n-d):
        swap(arr, 0, n-d, d)
        leftRotate(arr, d, n-d)
    else: # if B is shorter
        swap(arr, 0, d, n-d)
        leftRotate(arr[0]+n-d, 2*d-n, d)

def printArray(arr, size):
    i = 0
    for i in range(size):
        print("%d"% arr[i], end=' ')
    print("\n")

def swap(arr, fi, si, d):
    i = 0
    temp = list
    for i in range(d):
        temp = arr[fi + i]
        arr[fi + i] = arr[si+i]
        arr[si + i] = temp

# Driver program to test above function
arr = [1, 2, 3, 4, 5, 6, 7]
leftRotate(arr, 2, 7)
printArray(arr, 7)

Upon running this code it says a error saying TypeError: 'int' object is not subscriptable

[Running] python "b:\\Shall\\Practice\\Geeksforgeeks.org\\recursiveblockswap.py" Traceback (most recent call last): File "b:\\Shall\\Practice\\Geeksforgeeks.org\\recursiveblockswap.py", line 38, in <module> leftRotate(arr, 2, 7)

File "b:\\Shall\\Practice\\Geeksforgeeks.org\\recursiveblockswap.py", line 17, in leftRotate leftRotate(arr, d, nd)`

File "b:\\Shall\\Practice\\Geeksforgeeks.org\\recursiveblockswap.py", line 17, in leftRotate leftRotate(arr, d, nd) `

File "b:\\Shall\\Practice\\Geeksforgeeks.org\\recursiveblockswap.py", line 20, in leftRotate leftRotate(arr[0]+nd, 2*dn, d) `

File "b:\\Shall\\Practice\\Geeksforgeeks.org\\recursiveblockswap.py", line 12, in leftRotate swap(arr, 0, nd, d) File "b:\\Shall\\Practice\\Geeksforgeeks.org\\recursiveblockswap.py", line 32, in swap temp = arr[fi + i]

TypeError: 'int' object is not subscriptable`

[Done] exited with code=1 in 0.209 seconds

Answer 1

leftRotate(arr[0]+nd, 2*dn, d) in this you are passing an integer value to the variable arr this is causing an error at temp = arr[fi + i]

TypeError: 'int' object is not subscriptable`

basically means that you are accessing index of an int object.

Side Note:

in python you can swap values using

arr[1], arr[2] = arr[2], arr[1]