Python中无限元素列表的实现方法

def increment():
 i = 0
 while True:
  yield i
  i += 1
 
for j in increment():
 print i
 if (j > 10) : break

def fibonacci():
 i = j = 1
 while True:
  result, i, j = i, j, i + j
  yield result
 
for k in fibonacci():
 print k
 if (k > 100) : break