tang=0
while tang<10:
print(tang)
tang += 1
0 1 2 3 4 5 6 7 8 9
tangs=set([‘tang‘,‘yu‘,‘di‘])
while tangs:
tang=tangs.pop()
print(tang)
yu di tang
tang=set([‘tang‘,‘yu‘,‘di‘])
for name in tang:
print(name)
yu di tang
原文：https://www.cnblogs.com/AI-robort/p/11625397.html