Python - 一个dict可以有一个列表的值吗? [英] Python - can a dict have a value that is a list?
问题描述
当使用Python时,dict可能有一个值列表?
例如,一个字典如下所示(请参阅KeyName3值):
{
keyName1:value1,
keyName2:value2,
keyName3: {val1,val2,val3}
}
我已经知道我可以使用'defaultdict 然而,单个值(可理解地)作为列表返回。
我问的原因是我的代码必须是通用的,以便调用者可以将单键值作为项目(就像从一个dict键值)而不是列表(而不必指定 pop [0]
列表) - 但是也检索多个值作为列表。
如果没有,那么任何讽刺都是欢迎的。
如果有人可以帮助那么那将是伟大的。 / p>
感谢提前,
Paul
*我正在使用Python 2.6编写必须的脚本所以要向前兼容Python 3.0 +。
是的。 dict中的值可以是任何类型的python对象。密钥可以是任何可哈希的对象(不允许列表,但允许一个元组)。
您需要使用 []
,而不是 {}
创建列表:
{keyName1:value1,keyName2:value2,keyName3:[val1,val2,val3]}
When using Python is it possible that a dict can have a value that is a list?
for example, a dictionary that would look like the following (see KeyName3's values):
{
keyName1 : value1,
keyName2: value2,
keyName3: {val1, val2, val3}
}
I already know that I can use 'defaultdict' however single values are (understandably) returned as a list.
The reason I ask is that my code must be generic so that the caller can retieve single key values as an item (just like from a dict key-value) and not as list (without having to specify pop[0]
the list) - however also retrieve multiple values as a list.
If not then any suugestions would be welcome.
If someone can help then that would be great.
Thanks in Advance,
Paul
*I'm using Python 2.6 however writing scripts that must also be forward compatible with Python 3.0+.
Yes. The values in a dict can be any kind of python object. The keys can be any hashable object (which does not allow a list, but does allow a tuple).
You need to use []
, not {}
to create a list:
{ keyName1 : value1, keyName2: value2, keyName3: [val1, val2, val3] }
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