Python hasattr()

hasattr()方法有助於檢查給定的對象是否具有指定的屬性。如果屬性存在，則返回 true，否則返回 false。

 **hasattr(object, name)  **#Where object,name shows object name and attribute name respectively. 

hasattr()參數:

取 3 個參數。getattr()調用hasattr()方法，檢查是否要引發屬性錯誤。getattr()用於獲取指定對象的屬性值。

hasattr()返回值

返回值取決於getattr()函數。如果它引發了屬性錯誤，則返回假。否則，返回真。

| 投入 | 返回值 |
| 對象具有給定的命名屬性 | 真實的 |
| 對象沒有給定的命名屬性 | 錯誤的 |

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')) 

輸出:

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')) 

輸出:

Pankaj 

示例hasattr()如何返回布爾值？

 class Employee:  
    age = 21  
    name = 'Phill'  

employee = Employee()  

print('Employee has age?:', hasattr(employee, 'age'))  
print('Employee has salary?:', hasattr(employee, 'salary')) 

輸出:

Employee has age?: True
Employee has salary?: False