Execution of All Suffix Instructions Staying in a Grid LeetCode solution in Python

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class Solution:
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    def executeInstructions(self, n: int, startPos: List[int], s: str) -> List[int]:
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        result = []
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        for idx in range(len(s)):
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            count, row, col = 0, startPos[0], startPos[1]
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            while idx < len(s):
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                if s[idx] == "D":
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                    row += 1
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                    if row >= n:
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                        break
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                    count += 1
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                elif s[idx] == "U":
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                    row -= 1
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                    if row < 0:
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                        break
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                    count += 1
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                elif s[idx] == "R":
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                    col += 1
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                    if col >= n:
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                        break
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                    count += 1
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                else:
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                    col -= 1
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                    if col < 0:
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                        break
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                    count += 1
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                idx += 1
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            result.append(count)
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        return result