>>> class Student:

...     def __init__(self, name, grade, age):

...         self.name = name

...         self.grade = grade

...         self.age = age

...     def __repr__(self):

...         return repr((self.name, self.grade, self.age))

​

>>> student_tuples = [

...     ('john', 'A', 15),

...     ('jane', 'B', 12),

...     ('dave', 'B', 10),

... ]

>>> sorted(student_tuples, key=lambda student: student[2])   

# sort by age

[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]

​

arr = [

    {

    'id' : 1,

    'name' : 'Name 1'

    },

    {

    'id' : 4,

    'name' : 'Name 4'

    },

    {

    'id' : 2,

    'name' : 'Name 2'

    },

    {

    'id' : 3,

    'name' : 'Name 3'

    }

  ]

​

sorted_array = list(sorted(arr,key=lambda x:x['id']))

​

>>> sorted(student_tuples, key=itemgetter(2))

[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]

​

>>> student_objects = [

...     Student('john', 'A', 15),

...     Student('jane', 'B', 12),

...     Student('dave', 'B', 10),

... ]

>>> sorted(student_objects, key=lambda student: student.age)   # sort by age

[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]

​