从有条件的元组列表中选择值 [英] Select value from list of tuples where condition

问题描述

我有一个元组列表.每个元组都有5个元素(对应于5个数据库列)，我想进行查询

I have a list of tuples. Every tuple has 5 elements (corresponding to 5 database columns) and I'd like to make a query

select attribute1 from mylist where attribute2 = something

例如

personAge = select age from mylist where person_id = 10

是否可以通过某种方式查询元组列表?

Is it possible to query the list of tuples in some way?

推荐答案

如果您

If you have named tuples you can do this:

results = [t.age for t in mylist if t.person_id == 10]

否则使用索引:

results = [t[1] for t in mylist if t[0] == 10]

或者按照Nate的答案使用元组拆包.请注意，您不必为每一个拆开的物品都赋予一个有意义的名称.您可以执行(person_id, age, _, _, _, _)打开六项元组的包装.

Or use tuple unpacking as per Nate's answer. Note that you don't have to give a meaningful name to every item you unpack. You can do (person_id, age, _, _, _, _) to unpack a six item tuple.

这篇关于从有条件的元组列表中选择值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！