在Python中，可以使用sorted()函数来对数组进行排序，并通过参数key传入一个自定义的排序函数来按照不同的属性进行排序。下面是一个示例代码：

# 定义一个学生类
class Student:
    def __init__(self, name, age, score):
        self.name = name
        self.age = age
        self.score = score

    def __repr__(self):
        return f"Student(name={self.name}, age={self.age}, score={self.score})"

# 创建学生对象列表
students = [
    Student("Alice", 18, 90),
    Student("Bob", 19, 85),
    Student("Charlie", 17, 95),
    Student("David", 20, 80)
]

# 按照年龄升序排序
sorted_by_age = sorted(students, key=lambda student: student.age)
print(sorted_by_age)

# 按照分数降序排序
sorted_by_score = sorted(students, key=lambda student: student.score, reverse=True)
print(sorted_by_score)

输出结果为：

[Student(name=Charlie, age=17, score=95), Student(name=Alice, age=18, score=90), Student(name=Bob, age=19, score=85), Student(name=David, age=20, score=80)]
[Student(name=Charlie, age=17, score=95), Student(name=Alice, age=18, score=90), Student(name=Bob, age=19, score=85), Student(name=David, age=20, score=80)]

这样，我们就可以根据不同的属性对数组进行排序了。如果要分组，可以使用itertools.groupby()函数来实现。