Maximum 69 Number LeetCode solution in Python

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class Solution:
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    def maximum69Number(self, num):
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        lst = list(str(num))  #! convert the number to a list
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        for i in range(len(lst)):  #! iterate through the list
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            if lst[i] == "6":  #! if the element is 6
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                lst[i] = "9"  #! replace the element with 9
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                break  #! break the loop
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        return int("".join(lst))  #! convert the list to a number