为什么调用方法时会出现AttributeError？

Question

在此代码中，有一个

Person

类，它具有属性

name

，该属性在构造对象时设置。

应该这样做：

1. 创建类的实例时，属性会被正确设置
2. 当调用

   greeting()

   方法时，问候语会说明分配的名称。

class Person:
    def __init__(self, name):
        self.name = name
    def greeting(self):
        # Should return "hi, my name is " followed by the name of the Person.
        return "hi, my name is {}".format(self.name) 
    
# Create a new instance with a name of your choice
some_person = "xyz"  
# Call the greeting method
print(some_person.greeting())

它返回错误：

AttributeError：“str”对象没有属性“greeting”

Answer 1

您只是将变量设置为字符串，而不是

Person

类。这将生成一个名称为

Person

的

xyz

。

some_person = Person("xyz")

Answer 2

您的

some_person

变量是

str

对象的实例。哪个不具有属性

greeting

。

您的类

Person

应该先用

name

变量实例化，然后才能使用

greeting

:

some_person = Person(“xyz”)
print(some_person.greeting())
# "hi, my name is xyz”

Answer 3

#Use str method instead of greeting() method
def __str__(self):
    # Should return "hi, my name is " followed by the name of the Person.
    return "hi, my name is {}".format(self.name) 
some_person = Person("xyz")  
# Call the __str__ method
print(some_person)

Answer 4

class Person:
def __init__(self, name):
    self.name = name
def greeting(self):
    # Should return "hi, my name is " followed by the name of the Person.
    return name

# Create a new instance with a name of your choice
some_person = Person("Bob")
# Call the greeting method
print(f"hi, my name is {some_person.name}")

Answer 5

class Person:
    def __init__(self, name):
        self.name = name
    def greeting(self):
        # Should return "hi, my name is " followed by the name of the Person.
        return name

# Create a new instance with a name of your choice
some_person =  Person("XYZ")
# Call the greeting method
print(f"hi, my name is {some_person.name}")

Answer 6

class Person:
    def __init__(self, name):
        self.name = name
    def greeting(self):
        # Should return "hi, my name is " followed by the name of the Person.
        print("hi, my name is ",self.name)

# Create a new instance with a name of your choice
some_person = Person("Honey")

# Call the greeting method
print(some_person.greeting())

Answer 7

Class Person:
   def_init_(self,name):
      self.name = name
   def greeting(self):
      return name
Some_person = Person("Aisha")
Print("hi, my name is {}".format(Some_person.name))

输出：应打印

'hi, my name is Aisha'