s = (x*2 for x in range(2))
print(s)
print(next(s)) #等价于print(s.__next__()) in py2: s.next()
print(next(s))
print(next(s))
print(next(s))
print(next(s))
print(next(s))
#for i in range(100):
# print(next(s))
原文：https://www.cnblogs.com/styleonme/p/11153426.html