hasattr() 方法用于检查给定对象是否具有指定的属性。如果属性存在，则返回 True，否则返回 False。
hasattr(object, name) #Where object,name shows object name and attribute name respectively.
hasattr() 方法接受 3 个参数。它通过 getattr() 方法调用，以检查是否应引发 AttributeError。getattr() 用于获取指定对象属性的值。
| 参数 | 描述 | 必需/可选 |
|---|---|---|
| object | 要检查其命名属性的对象 | 必需 |
| 名称 | 要搜索的属性名称 | 必需 |
返回值取决于 getattr() 函数。如果它抛出 AttributeError，则返回 False。否则，返回 True。
| 输入 | 返回值 |
|---|---|
| 对象具有给定的命名属性 | True |
| 对象没有给定的命名属性 | False |
class Person:
age = 23
name = 'Adam'
pers
print('Person has age?:', hasattr(person, 'age'))
print('Person has salary?:', hasattr(person, 'salary'))
输出
Person has age?: True Person has salary?: False
class Employee:
id = 0
name = ''
def __init__(self, i, n):
self.id = i
self.name = n
d = Employee(10, 'Pankaj')
if hasattr(d, 'name'):
print(getattr(d, 'name'))
输出
Pankaj
class Employee:
age = 21
name = 'Phill'
employee = Employee()
print('Employee has age?:', hasattr(employee, 'age'))
print('Employee has salary?:', hasattr(employee, 'salary'))
输出
Employee has age?: True Employee has salary?: False
