tomer 发表于 2014-11-01 11:03

while


fridge={"egg":"5","bread":"6","tomato":"6","juice":"3","apple":"5"}
fridge_list=[]
while i in fridge.keys()
fridge_list.append(i)
print(fridge_list)
想得到fridge_list=["egg","bread","tomato","juice","apple"]

TasteOracle 发表于 2014-11-01 11:15

1、while后面需要加“：”
2、while里的变量要做初始赋值
3、while不需要，你直接打印fridge.keys()不就是你需要的吗

tomer 发表于 2014-11-01 11:50

回复 2# TasteOracle


    fridge.keys()结果是
dict_keys(['apple', 'tomato', 'juice', 'bread', 'egg'])
怎么还有个“dict_keys",不想要
>>> fridge={"egg":"5","bread":"6","tomato":"6","juice":"3","apple":"5"}
>>> fridge.keys()
dict_keys(['apple', 'tomato', 'juice', 'bread', 'egg'])
>>> aa=[]
>>> aa=fridge.keys()
>>> print(aa)
dict_keys(['apple', 'tomato', 'juice', 'bread', 'egg'])
>>>

tomer 发表于 2014-11-01 14:04

回复 2# TasteOracle


    这里使用：

fridge={"egg":"5","bread":"6","tomato":"6","juice":"3","apple":"5"}
fridge_list=list(fridge)
print(fridge_list)

可以得到想要的结果，但是我就想用while循环，怎么才能出这样的结果呢

whitelotus19 发表于 2014-11-01 20:14

>>> fridge={"egg":"5","bread":"6","tomato":"6","juice":"3","apple":"5"}
>>> fridge
{'tomato': '6', 'juice': '3', 'egg': '5', 'apple': '5', 'bread': '6'}
>>>
['tomato', 'juice', 'egg', 'apple', 'bread']
>>> fridge.keys()
dict_keys(['tomato', 'juice', 'egg', 'apple', 'bread'])
>>>

tomer 发表于 2014-11-01 21:53

回复 5# whitelotus19


    如何使用while:

whitelotus19 发表于 2014-11-03 18:01

tomer 发表于 2014-11-01 21:53 static/image/common/back.gif
回复 5# whitelotus19




我很好奇为什么这个问题一定要用while来做？for循环不是挺简单的吗

tomer 发表于 2014-11-04 09:53

回复 7# whitelotus19

书上要求用while
   
页: [1]
查看完整版本: while