Check for multiple attribute matches in an array of objects

Question

我有一个对象数组（它们都是相同的对象类型），并且它们具有多个属性，有没有一种方法可以返回较小的对象数组，其中所有属性都与测试用例，字符串匹配，无论该属性类型是什么。

Answer 1

Use a list comprehension with all() ; the following presumes that a list_of_attributes has been predefined to enumerate what attributes you wanted to test:

sublist = [ob for ob in larger_list if all(getattr(ob, attr) == 'some test string' for attr in list_of_attributes)]

Alternatively, if your input list is large, and you only need to access the matching elements one by one, use a generator expression:

filtered = (ob for ob in larger_list if all(getattr(ob, attr) == 'some test string' for attr in list_of_attributes))
for match in filtered:
    # do something with match

or you can use the filter() function :

filtered = filter(lambda ob: all(getattr(ob, attr) == 'some test string' for attr in list_of_attributes)
for match in filtered:
    # do something with match

Instead of using a pre-defined list_of_attributes , you could test all the attributes with the vars() function ; this presumes that all instance attributes need to be tested:

all(value == 'some test string' for key, value in vars(ob))