或用以下方法缩短David的答案：
if 4 <= day <= 20 or 24 <= day <= 30: suffix = "th"else: suffix = ["st", "nd", "rd"][day % 10 - 1]
或用以下方法缩短David的答案：
if 4 <= day <= 20 or 24 <= day <= 30: suffix = "th"else: suffix = ["st", "nd", "rd"][day % 10 - 1]
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