实例化一个类 - Python

Question

我想在Python中实例化一个简单的类。

class Student: 
    def __init__(self, name, age, major, gpa): 
     name = self.name 
     age = self.age 
     major = self.major 
     gpa = self.gpa 


def main(): 
    student_1 = Student('John', 31, 'History', 3.4) 
    student_2 = Student('George', 31, 'English', 3.5) 
    print student_1.name, student_2.name 

我得到的错误是：

AttributeError: Student instance has no attribute 'name'

Answer 1

变化：

name = self.name 
    age = self.age 
    major = self.major 
    gpa = self.gpa 

到：

self.name = name 
    self.age = age 
    self.major = major 
    self.gpa = gpa 

Answer 2

你得到这个错误，因为你之前访问属性定义它们。那是因为你有你的作业错误的方式 - 你尝试分配（未定义）属性的参数，而不是倒过来：

def __init__(self, name, age, major, gpa): 
    self.name = name 
    self.age = age 
    self.major = major 
    self.gpa = gpa