Python交互式程序与While循环
（1）用户输入——input()
message=input('show me a number and I will tell you if it is an odd number: ')
number=int(message)
if number % 2==0:
print(str(number)+' is not an odd number!')
else:
print(str(number)+' is an odd number!')
（2）While循环
msg='please enter what you want to eat: '
msg+='\n(enter "quit"when you have finished)'
active=True
food=[]
while active:
information=input(msg)
if information!='quit':
food.append(information)
else:
active=False
print('you have ordered the following items:')
for f in food:
print(f)
（3）break语句
msg='please enter what you want to eat: '
msg+='\n(enter "quit"when you have finished)'
food=[]
while True:
information=input(msg)
if information!='quit':
food.append(information)
else:
break
print('you have ordered the following items:')
for f in food:
print(f)
（4）continue语句
digits=range(10)
for d in digits:
if d %2 ==0:
continue
print(d)
