英文文档:
getattr
(object, name[, default])- Return the value of the named attribute of object. name must be a string. If the string is the name of one of the object’s attributes, the result is the value of that attribute. For example,
getattr(x, ‘foobar‘)
is equivalent tox.foobar
. If the named attribute does not exist, default is returned if provided, otherwiseAttributeError
is raised. - 获取对象的属性值
- 说明:
- 1. 函数功能是从对象object中获取名称为name的属性,等效与调用object.name。
#定义类Student >>> class Student: def __init__(self,name): self.name = name >>> s = Stduent(‘Aim‘) >>> getattr(s,‘name‘) #等效于调用s.name ‘Aim‘ >>> s.name ‘Aim‘
2. 函数第三个参数default为可选参数,如果object中含义name属性,则返回name属性的值,如果没有name属性,则返回default值,如果default未传入值,则报错。
#定义类Student >>> class Student: def __init__(self,name): self.name = name >>> getattr(s,‘name‘) #存在属性name ‘Aim‘ >>> getattr(s,‘age‘,6) #不存在属性age,但提供了默认值,返回默认值 6 >>> getattr(s,‘age‘) #不存在属性age,未提供默认值,调用报错 Traceback (most recent call last): File "<pyshell#17>", line 1, in <module> getattr(s,‘age‘) AttributeError: ‘Stduent‘ object has no attribute ‘age‘