Python中的结构 [英] structure in Python

问题描述

您好：

我有下一个结构：

[key1，value1，value2]


[''A ''，1,5]

[''B''，6,7]


如何使用Python制作它？


如何更新6的值？

如何插入名为C的键？及其值？

如何删除名为B的键？

如何搜索名为A的键（参数）并获取其值？


问候

解决方案

Dora and Boots说：说地图！说地图！"

stuff = {''A''：[1,5]，'' B''：[6,7]}
东西[''B''] [0] + = 6
东西
{''A''：[1,5]， ''B''：[12,7]}东西[''C''] = [33,44]
del stuff [''B'']
打印东西[" A" ]

[1,5]


- 马特


" Alberto Vera"写道：

我有下一个结构：

[key1，value1，value2]


如何使用Python制作它？

如何更新6的值？

如何插入名为C的密钥？及其值？

如何删除名为B的键？

如何搜索名为A的键（参数）并获取其值？

2003年10月20日星期一18:13:48 -0500，Alberto Vera< av *** @ coes.org.pe>写道：

你好：
我有下一个结构：
[key1，value1，value2]

[''A''，1， 5]
[''B''，6,7]

如何使用Python制作它？


您可以使用长度为2的列表。


d = {

A： [1,5]，

" B"：[6,7]，＃last尾随逗号是可选的但是好的风格

}

如何更新6的值？


6将始终为6，数字是不可变的，你不能改变它。但你可以用键B改变列表的第一项。与


d [" B"] [0] = 2


现在


d [ B]


将返回[2,7]

如何插入名为C的密钥？和它的价值观？


d [" C"] = [8,9]

如何删除名为B的密钥？


del d [" B"]

如何搜索名为A（参数）的密钥并获取其值？

d [" A"]


您还可以使用多个赋值将变量绑定到值


（value1，value2）= d [" A"]

如果找不到密钥，则引发KeyError异常。如果您愿意，可以使用d.has_key（A）测试是否存在密钥。
。阅读

" Mapping types"在Python库参考中

http：// python .org / doc / lib / lib.html


描述了dict对象的方法。


-

Ben Caradoc-Davies< be*@wintersun.org>
http： //wintersun.org/

到达时的监禁是澳大利亚真正的移民经历。

2003年10月20日星期一18 ：13：48-505，Alberto Vera， < av *** @ coes.org.pe>

写道：

你好：
我有下一个结构：
[key1，value1，value2]

[''A''，1,5]
[''B''，6,7]

我怎样才能使用Python？


使用带有列表中值的字典：

listdict = {'' A'：[1,5]，''B''：[6,7]}
打印listdict
{''A''：[1,5]，''B'' ：[6,7]}

如何更新6的值？
print listdict [''B''] [0]
6 listdict [''B''] [0] = 28
print listdict [''B''] [0]
28

如何插入名为C的密钥？和它的价值观？
listdict [''C''] = [1,2,3]
print listdict
{''A''：[1,5]，''C''：[ 1,2,3，''B''：[28,7]}

如何删除名为B的密钥？
del listdict [''B'']
print listdict
{''A''：[1,5]，''C''：[1,2,3]}

如何搜索名为A（参数）的键并获取其值？
如果在listdict中''A''：

.... print listdict [''A'']

....

[1,5]


问候

尝试搜索Python文档或参考教程：
http://www.python.org/doc/current/tut/tut.html


-

克里斯托弗

Hello:
I have the next structure:
[key1,value1,value2]

[''A'',1,5]
[''B'',6,7]

How Can I make it using Python?

How Can I update the value of 6?
How Can I insert a key called "C" and its values?
How Can I delete a key called "B"?
How Can I search a key called "A"(parameter) and get its values?

Regards

解决方案

Dora and Boots say: "Say map! Say map!"

stuff = { ''A'' : [1,5], ''B'' : [6,7] }
stuff[''B''][0] += 6
stuff {''A'': [1, 5], ''B'': [12, 7]} stuff[''C''] = [33,44]
del stuff[''B'']
print stuff["A"]

[1, 5]

- Matt

"Alberto Vera" wrote:
I have the next structure:
[key1,value1,value2]

How Can I make it using Python?
How Can I update the value of 6?
How Can I insert a key called "C" and its values?
How Can I delete a key called "B"?
How Can I search a key called "A"(parameter) and get its values?

On Mon, 20 Oct 2003 18:13:48 -0500, Alberto Vera <av***@coes.org.pe> wrote:

Hello:
I have the next structure:
[key1,value1,value2]

[''A'',1,5]
[''B'',6,7]

How Can I make it using Python?
You could use a dict of lists of length 2.

d = {
"A": [1, 5],
"B": [6, 7], # last trailing comma is optional but good style
}
How Can I update the value of 6?
6 will always be 6, numbers are immutable, and you can''t change it. But you can
change the first item of the list with key "B" with

d["B"][0] = 2

now

d["B"]

will return [2, 7]
How Can I insert a key called "C" and its values?
d["C"] = [8, 9]
How Can I delete a key called "B"?
del d["B"]
How Can I search a key called "A"(parameter) and get its values?

d["A"]

You could also use multiple assignment to bind variables to the values with

(value1, value2) = d["A"]

If a key is not found, a KeyError exception is raised. If you prefer, you can
test for the existence of the key with d.has_key("A") . Read the section on
"Mapping types" in the Python Library Reference

http://python.org/doc/lib/lib.html

which describes the methods of dict objects.

--
Ben Caradoc-Davies <be*@wintersun.org>
http://wintersun.org/
Imprisonment on arrival is the authentic Australian immigration experience.

On Mon, 20 Oct 2003 18:13:48 -0500, "Alberto Vera" <av***@coes.org.pe>
wrote:

Hello:
I have the next structure:
[key1,value1,value2]

[''A'',1,5]
[''B'',6,7]

How Can I make it using Python?
Use a dictionary with the values in lists:

listdict = {''A'': [1, 5], ''B'': [6, 7]}
print listdict {''A'': [1, 5], ''B'': [6, 7]}

How Can I update the value of 6? print listdict[''B''][0] 6 listdict[''B''][0] = 28
print listdict[''B''][0] 28
How Can I insert a key called "C" and its values? listdict[''C''] = [1, 2, 3]
print listdict {''A'': [1, 5], ''C'': [1, 2, 3], ''B'': [28, 7]}
How Can I delete a key called "B"? del listdict[''B'']
print listdict {''A'': [1, 5], ''C'': [1, 2, 3]}
How Can I search a key called "A"(parameter) and get its values? if ''A'' in listdict:

.... print listdict[''A'']
....
[1, 5]


Regards

Try searching the Python documentation or take the Tutorial:
http://www.python.org/doc/current/tut/tut.html

--
Christopher

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