Python 循环和条件语句奇怪嵌套

if 在循环体内，else在循环体外，当循环结束且if条件不满足时，执行else语句。《Python基础教程》5.5.6 循环中的else子句(p82)
1：举例如下(else在循环外，只执行一次):from math import sqrt for n in range(99,81,-1): root=sqrt(n) if root==int(root): print n break else: print "Didn't find it!"  运行结果:Didn't find it!2：举例如下(else在循环内):

from math import sqrt
for n in range(99,81,-1):
root=sqrt(n)
if root==int(root):
print n
break
else:
print "Didn't find it!"

运行结果：Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!
Didn't find it!