Write a Python function that takes a string as input and returns the length of the longest palindromic substring within the string

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Write a Python function that takes a string as input and returns the length of the longest palindromic substring within the string

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Thank you but it does not the lemgth of the string. I want the out as len(aabbaa)

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What could have wrong with my code below?

 

### START FUNCTION 
def longest(s:str)->str:                   # The desired function,
    n = len(s)
    st = 0
    maxi = 0
    start = 0
    dicti = {}                                 # The desired function.
    dicti[s[0]] = 0
    for i in range(1, n):               
        if s[i] not in dicti:
            dicti[s[i]] = i
        else:
            if dicti[s[i]] >= st:           # Checking for the current and maxlength.
                curi = i - st
                if maxi < curi:
                    maxi = curi
                    start = st
                    st = dicti[s[i]] + 1
                    dicti[s[i]] = i
                if maxi < i - st:
                    maxi = i - st
                    start = st
    return s[start : start + maxi]    # Maximum lenngth substing.

                                    #print(longest("aabbaababa"))

### END FUNCTION

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