Checking if a string is palindrome

Question

So i'm trying to write a function that checks if a string is palindrome or not ( palindrome if it spells the same backwards e.g.: hannah)

This is a solution i saw online and i don't quite understand it, any simple explanation would be appreciated

def isPalindrome(string):
    left_pos = 0
    right_pos = len(string) - 1
    
    while right_pos >= left_pos:
        if not string[left_pos] == string[right_pos]:
            return False
        left_pos += 1
        right_pos -= 1
    return True
    
print(isPalindrome('hannah')) 

Edit: Sorry for my lack of clarity, i mostly dont understand the condition set in the while loop and the logic behind the if statement.

Answer 1

It compares the last character with the first and moves inside the string as follows:

hannah
^    ^

check the two letters are equal: (return False if not) move the index by 1

hannah
 ^  ^

Do the same check

hannah
  ^^

right index = left index at this point

return True in this case