学生ppt提到了一个示例代码（现在回过头来看，这个语句对初学者而言，难度有点高了），里面用了一个for..else语法。这个代码让我很诧异。
num=[]
for i in range(2,100):
for j in range(2,i):
if i%j==0: break
else:
num.append(i)
print(num)这个示例代码是求100以内的质数。算法本身很简单，但for..else语言在别的编程语言里很少有用到，我算是第一次见到这种逻辑控制，开始我还误以为else是匹配到if中。
在网上搜索后，这个网站讲的很明白：
https://foofish.net/for-else.html
简言之：for..else语句，只要for语句中没有执行break语句，则else中代码必然要执行。
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