元组键值

Tuple value by key(元组键值)

问题描述

是否可以从元组中获取价值:

Is it possible to get Value out of tuple:

TUPLE = (
    ('P', 'Shtg1'),
    ('R', u'Shtg2'),
    ('D', 'Shtg3'),
)

通过调用像 P

Python 说只有 int 可以用于这种类型的查询"

Python says that only int can be used for this type of 'query'

我不能使用循环(开销太大...)

I can't use loop (too much overhead...)

谢谢！

推荐答案

此类查询的规范数据结构是字典:

The canonical data structure for this type of queries is a dictionary:

In [1]: t = (
   ...:     ('P', 'Shtg1'),
   ...:     ('R', u'Shtg2'),
   ...:     ('D', 'Shtg3'),
   ...: )

In [2]: d = dict(t)

In [3]: d['P']
Out[3]: 'Shtg1'

如果使用元组，则无法避免循环(显式或隐式).

If you use a tuple, there is no way to avoid looping (either explicit or implicit).

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