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hasattr(对象," 属性名 " ) 返回布尔值
getattr(对象," 属性名 " ) 有则返回 值 ,无则报错
对象.__ getattibute __(" 属性名 " ) 有则返回 值 ,无则报错
**hasattr()**例子:
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
b = hasattr(a, "name") #有该属性
c = hasattr(a, "sex") #无该属性
print(b)
print(c)
结果:
True
False
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
b = getattr(a, "name")
print(b)
结果:
人类
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
b = getattr(a, "sex")
print(b)
结果:
AttributeError: 'A' object has no attribute 'sex'
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
b = a.__getattribute__("name")
print(b)
b = a.__getattribute__("sex")
print(b)
结果:
人类
AttributeError: 'A' object has no attribute 'sex'
(有则改之,无则加勉)
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
# 对象.属性名 改
a.name = "女娲"
print(a.name)
# 对象.属性名 增
a.sex = "女性"
print(a.sex)
结果:
女娲
女性
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
# setattr() 改
setattr(a, "name", "女娲")
print(a.name)
# setattr() 增
setattr(a, "sex", "女性")
print(a.sex)
结果:
女娲
女性
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
# setattr() 改
a.__setattr__("name", "女娲")
print(a.name)
# setattr() 增
a.__setattr__("sex", "女性")
print(a.sex)
结果:
女娲
女性
class A:
def __init__(self, name, age):
self.name = name
self.age = age
a = A("人类", 100)
a.__setattr__("name", "女娲")
a.__setattr__("sex", "女性")
delattr(a, "name")
a.__delattr__("sex")
print(a.name)
print(a.sex)
AttributeError: 'A' object has no attribute 'name'
AttributeError: 'A' object has no attribute 'sex'
