为什么python中没有do while循环
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Why there is no do while loop in python
提问by Bahubali Patil
Why doesn't Python have a 'do while' loop like many other programming language, such as C?
为什么 Python 不像许多其他编程语言（例如 C）那样具有“do while”循环？
Example : In the C we have do while loop as below :
示例：在 C 中，我们有如下 while 循环：
do {
statement(s);
} while( condition );
回答by Martijn Pieters
There is no do...whileloop because there is no nice way to define one that fits in the statement: indented blockpattern used by every other Python compound statement. As such proposals to add such syntax have never reached agreement.
没有do...while循环，因为没有很好的方法来定义一个适合statement: indented block所有其他 Python 复合语句使用的模式的循环。因此，添加此类语法的建议从未达成一致。
Nor is there really any needto have such a construct, not when you can just do:
也没有必要拥有这样的构造，而不是当您可以这样做时：
while True:
# statement(s)
if not condition:
break
and have the exact same effect as a C do { .. } while conditionloop.
并具有与 Cdo { .. } while condition循环完全相同的效果。
See PEP 315 -- Enhanced While Loop:
Rejected [...] because no syntax emerged that could compete with the following form:
while True: <setup code> if not <condition>: break <loop body>A syntax alternative to the one proposed in the PEP was found for a basic do-while loop but it gained little support because the condition was at the top:
do ... while <cond>: <loop body>
被拒绝 [...] 因为没有出现可以与以下形式竞争的语法：
while True: <setup code> if not <condition>: break <loop body>为基本的 do-while 循环找到了 PEP 中提议的语法替代方案，但它获得的支持很少，因为条件位于顶部：
do ... while <cond>: <loop body>
or, as Guido van Rossum put it:
或者，正如Guido van Rossum 所说：
Please reject the PEP. More variations along these lines won't make the language more elegant or easier to learn. They'd just save a few hasty folks some typing while making others who have to read/maintain their code wonder what it means.
请拒绝 PEP。沿着这些路线的更多变化不会使语言更优雅或更容易学习。他们只是让一些匆忙的人打字，而让其他必须阅读/维护他们的代码的人想知道这意味着什么。
