与 Django 的“重新组合"模板标签等价的惯用 Python 是什么? [英] What's the idiomatic Python equivalent to Django's 'regroup' template tag?

问题描述

http://docs.djangoproject.com/en/dev/ref/templates/builtins/#regroup

我可以想到几种用循环来做的方法，但我特别想知道是否有一个简洁的单行.

I can think of a few ways of doing it with loops but I'd particularly like to know if there is a neat one-liner.

推荐答案

Combine itertools.groupby 与 operator.itemgetter 得到一个很好的解决方案:

Combine itertools.groupby with operator.itemgetter to get a pretty nice solution:

from operator import itemgetter
from itertools import groupby

key = itemgetter('gender')
iter = groupby(sorted(people, key=key), key=key)

for gender, people in iter:
    print '===', gender, '==='
    for person in people:
        print person

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