如何从不同的方法（类外）访问类的值

Question

我有这种平静的代码，我试图在一个类中打印出一个字典，我如何从不同的方法访问值并指定要打印的值

class Student:

    student_instance_dict            = {}

    def __init__(self, student):


        self.name = None 
        self.phoneNumber = 0


students = ['Mike', 'Dany']
for student in students:
    instance = Student(student)
    Student.student_instance_dict[student] = instance


    print (Student.student_instance_dict[student].name)#this prints out without any problems

def printUpdates(x):
    print (Student.student_instance_dict[student].x)

name = 'name'
printUpdates(name) 

las 行返回 AttributeError: 'Student' object has no attribute 'x'

Answer 1

Student.student_instance_dict[student].x 将检查对象Student.student_instance_dict[student] 是否有一个名为x 的属性，而您的对象没有该属性。看起来您要做的是创建一个函数，该函数将获取名称作为字符串传入的属性的值。为此，请使用getattr():

def printUpdates(x):
    print(getattr(Student.student_instance_dict[student], x))