The simplest flow control statement is the if statement, whose basic syntax is demonstrated in the pseudocode shown in Listing 4.

最简单的流控制语句是if 语句，它的基本语法在清单 4中的伪代码中演示了。

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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.

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。

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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.

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。

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