Wie Wörterbücher von Objekten nach Attributwert in Python zu sortieren?

Question

Ich möchte ein Wörterbuch von Objekten in einem atribute Weise

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) 

Nachricht Das gibt mir die eror sortiert iterieren: „Attribute:‚str‘Objekt hat kein Attribut‚Alter‘“

Answer 1

for student in (sorted(student_Dict.values(), key=operator.attrgetter('age'))): 
    print(student.name) 

Answer 2

Wie ist in der Dokumentation der sorted Methode

sorted(student_Dict.keys(), key=lambda student: student.age) 

Answer 3

>>> for key in sorted(student_Dict, key = lambda name: student_Dict[name].age): 
...  print key 
... 
dave 
jane 
john 

Answer 4

012 zeigten

Quelle: https://wiki.python.org/moin/HowTo/Sorting