A control flow statement forms a complete unit of execution.
控制流语句形成执行的完整单元。
A compound statement consists of a flow control instruction, followed by a colon character (:), followed by a block of program statements.
一个复合语句包括一个流控制指令，后跟一个冒号(：)，然后再是一个程序语句块。
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.
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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