[英]How to sort dictionaries of objects by attribute value?
我想以属性排序的方式遍历对象字典
import operator
class Student:
def __init__(self, name, grade, age):
self.name = name
self.grade = grade
self.age = age
studi1 = Student('john', 'A', 15)
studi2 = Student('dave', 'B', 10)
studi3 = Student('jane', 'B', 12)
student_Dict = {}
student_Dict[studi1.name] = studi1
student_Dict[studi2.name] = studi2
student_Dict[studi3.name] = studi3
for key in (sorted(student_Dict, key=operator.attrgetter('age'))):
print(key)
这给了我错误信息: AttributeError: 'str' object has no attribute 'age'
for student in (sorted(student_Dict.values(), key=operator.attrgetter('age'))):
print(student.name)
>>> for key in sorted(student_Dict, key = lambda name: student_Dict[name].age):
... print key
...
dave
jane
john
如何在排序方法的文档中显示
sorted(student_Dict.keys(), key=lambda student: student.age)
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_objects = [
Student('john', 'A', 15),
Student('jane', 'B', 12),
Student('dave', 'B', 10),
]
print student_objects
student_objects.sort(key=attrgetter('age'))
print student_objects
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