human
What is a the Python code you requested given the following:
I found an interesting problem on https://leetcode.com/problems/greatest-common-divisor-of-strings/:
For two strings s and t, we say "t divides s" if and only if s = t + ... + t  (t concatenated with itself 1 or more times)
Given two strings str1 and str2, return the largest string x such that x divides both str1 and str2.
 
Example 1:
Input: str1 = "ABCABC", str2 = "ABC"
Output: "ABC"
Example 2:
Input: str1 = "ABABAB", str2 = "ABAB"
Output: "AB"
Example 3:
Input: str1 = "LEET", str2 = "CODE"
Output: ""
Example 4:
Input: str1 = "ABCDEF", str2 = "ABC"
Output: ""

 
Constraints:

1 <= str1.length <= 1000
1 <= str2.length <= 1000
str1 and str2 consist of English uppercase letters.

I tried it in Python, but could not do it. Can you solve it?
assistant
#Here is the Python code you requested.

class Solution:
    def gcdOfStrings(self, str1: str, str2: str) -> str:
        m, n = len(str1), len(str2)
        candidate, curr = '', ''
        
        for i in range(min(m, n)):
            if str1[i] != str2[i]:
                break
            else:
                curr += str1[i]
                if m % len(curr) == 0 and n % len(curr) == 0:
                    if str1 == curr * (m // len(curr)) and str2 == curr * (n // len(curr)):
                        candidate = curr
        
        return candidate