目录字符串类型代码的执行eval()exec()compile()字符串类型代码的执行 字符串类型代码的执行函数有三个，都是P编程客栈ython的内置函数。
How would you describe and explain Cocoa in non-technical terms, with lots of analogies to common, everyday things. For example, imagine you are describing it to a 5-year-old who keeps asking why? at
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