与另外两种方法相比，该方法有许多优点，它允许我们保持第二种方法的可表达性以及与第一种方法中相同的静态检查程度。
This approach has many advantages over the other two, allowing us to keep the expressiveness of the second approach and the same degree of static checking as in the first.
Python中的第二种流控制语句是while循环，它在一个表达式计算为True时执行一个程序语句块。
The second type of flow control statement in Python is the while loop, which executes a block of program statements while an expression evaluates True.
第二种方法是动态执行字符串表达式包含编程命令。
The second approach is dynamic execution of string expressions that contain programming commands.
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