Python hasattr()

hasattr()方法有助于检查给定的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()参数:

取 3 个参数。getattr()调用hasattr()方法，检查是否要引发属性错误。getattr()用于获取指定对象的属性值。

hasattr()返回值

返回值取决于getattr()函数。如果它引发了属性错误，则返回假。否则，返回真。

| 投入 | 返回值 |
| 对象具有给定的命名属性 | 真实的 |
| 对象没有给定的命名属性 | 错误的 |

Python 中hasattr()方法的示例

示例hasattr()在 Python 中是如何工作的？

 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 

示例hasattr()如何使用示例？

 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 

示例hasattr()如何返回布尔值？

 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