组合多个对象并在python中创建重叠属性列表

Question

我有一个类如下：

class test(object):
    def __init__(self, ID, A, B, C, D, E):
        self.ID = ID
        self.A = A
        self.B = B
        self.C = C
        self.D = D
        self.E = E

列表中的多个对象：

test1 = test(6124, 6, 'Tim', 'Football', 'Soccer', 'USA')
test2 = test(6124, 7, 'Joe', 'Basketball', 'Soccer', 'USA')
test3 = test(6188, 8, 'Joe', 'Basketball', 'Soccer', 'USA')
test4 = test(6188, 9, 'Joe', 'Basketball', 'Soccer', 'USA')
test5 = test(6188, 10, 'Tim', 'Football', 'Soccer', 'USA')

objects_list = [test1, test2, test3, test4, test5]

我想基于它们的ID属性合并这些对象，对于其余属性，只需列出各个对象：

对于此示例，结果将是两个对象（仅作为两个唯一ID），其中一个具有属性：

self.ID = 6124
self.A = [6, 7]
self.B = ['Tim', 'Joe']
self.C = ['Football', 'Basketball']
self.D = ['Soccer', 'Soccer']
self.E = ['USA', 'USA]

如何以这种方式合并列表中的对象？我正在寻找一个解决方案，它不需要我命名任何属性，但我要合并的属性的名称（ID）。如果这个解决方案可以被推广到一次合并多个属性（比如ID和A和E），那将是特别好的。

谢谢！插口

Answer 1

尝试此解决方案：

from operator import attrgetter
from itertools import groupby


class Test(object):
    def __init__(self, ID, A, B, C, D, E):
        self.ID = ID
        self.A = A
        self.B = B
        self.C = C
        self.D = D
        self.E = E


test1 = Test(6124, 6, 'Tim', 'Football', 'Soccer', 'USA')
test2 = Test(6124, 7, 'Joe', 'Basketball', 'Soccer', 'USA')
test3 = Test(6188, 8, 'Joe', 'Basketball', 'Soccer', 'USA')
test4 = Test(6188, 9, 'Joe', 'Basketball', 'Soccer', 'USA')
test5 = Test(6188, 10, 'Tim', 'Football', 'Soccer', 'USA')

objects_list = [test1, test2, test3, test4, test5]

# get names of attributes except 'ID'
attrs = list(x for x in dir(test1) if not x.startswith('__') and x != 'ID')

# iterate through grouped by 'ID' elements
for id_, group in groupby(sorted(objects_list, key=attrgetter('ID')),
                          key=attrgetter('ID')):
    # create result object with lists as attributes
    result = Test(id_, *[[]]*len(attrs))

    # merge elements
    for x in group:
        for a in attrs:
            setattr(result, a, getattr(result, a) + [getattr(x, a)])

    print(result.ID, result.A, result.B, result.C, result.D, result.E)

结果：

6124 [6, 7] ['Tim', 'Joe'] ['Football', 'Basketball'] ['Soccer', 'Soccer'] ['USA', 'USA']
6188 [8, 9, 10] ['Joe', 'Joe', 'Tim'] ['Basketball', 'Basketball', 'Football'] ['Soccer', 'Soccer', 'Soccer'] ['USA', 'USA', 'USA']