continue: 返回到循环开头，并根据条件测试结果决定是否继续执行循环。
例：
n=0
while n<10:
n+=1
if n%2==0:
continue #返回到循环开头
print(n)
运行结果：
====================== RESTART: D:/python学习/continue.py ====================== 1 3 5 7 9 >>>
break：用于控制程序的流程，可使用它来控制哪些代码行将执行，从而让程序按你的要求执行。（在循环中都可使用break语句，立即退出不再执行余下的代码）
例：
prompt='\nPlease enter the name of a city you have visited:'
prompt+='\n(Enter "quit" when you are finished.'
while True:
city=input(prompt)
if city=="quit":
break
else:
print("I'd love to go to "+city.title()+"!") #title() 方法返回"标题化"的字符串,就是说所有单词都是以大写开始，其余字母均为小写
运行结果：
>>>
======================= RESTART: D:/python学习/break.py =======================
Please enter the name of a city you have visited:
(Enter "quit" when you are finished.beigjing
I'd love to go to Beigjing!
Please enter the name of a city you have visited:
(Enter "quit" when you are finished.广州
I'd love to go to 广州!
Please enter the name of a city you have visited:
(Enter "quit" when you are finished.quit
>>>
