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标题: while [打印本页]

作者: tomer 时间: 2014-11-01 11:03
标题: 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)

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想得到fridge_list=["egg","bread","tomato","juice","apple"]

作者: TasteOracle 时间: 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

作者: tomer 时间: 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'])
>>>

作者: tomer 时间: 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)

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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

作者: whitelotus19 时间: 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'}
>>> [x for x in fridge.keys()]
['tomato', 'juice', 'egg', 'apple', 'bread']
>>> fridge.keys()
dict_keys(['tomato', 'juice', 'egg', 'apple', 'bread'])
>>>

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作者: tomer 时间: 2014-11-01 21:53
回复 5# whitelotus19

如何使用while:

作者: whitelotus19 时间: 2014-11-03 18:01

tomer 发表于 2014-11-01 21:53
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

作者: tomer 时间: 2014-11-04 09:53
回复 7# whitelotus19

书上要求用while

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