Maximum Number of Balls in a Box LeetCode solution in Python

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class Solution:
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    def countBalls(self, lowLimit: int, highLimit: int) -> int:
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        boxes = [0] * 100
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        for i in range(lowLimit, highLimit + 1):
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            # For the current number "i", convert it into a list of its digits.
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            # Compute its sum and increment the count in the frequency table.
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            boxes[sum([int(j) for j in str(i)])] += 1
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        return max(boxes)