【编程语法-python】字符串
字符串是不能改变的
例如
s = 'abc' s[0] = '1' # 错误的
另外在构建候选对比元素时：
字符串和字典的速度比较快，元组和列表比较慢
vowels = "aeiouAEIOU" # 56ms
vowels = ["a", "e","i","o","u","A","E","I","O","U"] # 72ms
vowels = {"a", "e","i","o","u","A","E","I","O","U"} # 52ms
vowels = ("a", "e","i","o","u","A","E","I","O","U") # 72ms
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，那举办了
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