實例化一個類 - Python

Question

我想在Python中實例化一個簡單的類。

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 

我得到的錯誤是：

AttributeError: Student instance has no attribute 'name'

Answer 1

變化：

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

你得到這個錯誤，因爲你之前訪問屬性定義它們。那是因爲你有你的作業錯誤的方式 - 你嘗試分配（未定義）屬性的參數，而不是倒過來：

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