problems to solve for recursion in python code example

Example 1: recursion python problems

def productOfArray(arr):    if len(arr) == 0:        return 0    if len(arr) == 1:        return arr[0]    else:        return arr[len(arr)-1] * productOfArray(arr[:len(arr)-1])

Example 2: recursion python problems

def isPalindrom(strng):    if len(strng) == 0:        return True    if strng[0] != strng[len(strng)-1]:        return False    return isPalindrome(strng[1:-1])