描述器#
class Ten:
def __get__(self, obj, objtype=None):
return 10
class Ten:
def __get__(self, obj, objtype=None):
x = 1
print("局部变量1：", locals()["x"])
print("参数：\n", obj, objtype)
x = 12
print("局部变量2：", locals()["x"])
print("x:", x)
return 10
import logging
logging.basicConfig(level=logging.INFO)
class LoggedAgeAccess:
def __get__(self, obj, objtype=None):
value = obj._age
logging.info('Accessing %r giving %r', 'age', value)
return value
def __set__(self, obj, value):
logging.info('Updating %r to %r', 'age', value)
obj._age = value
class Person:
age = LoggedAgeAccess()
def __init__(self, name, age):
self.name = name
self.age = age
def birthday(self):
self.age += 1
mary = Person('Mary M', 30)
INFO:root:Updating 'age' to 30
mary.age = 20
INFO:root:Updating 'age' to 20
add.cache
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[6], line 1
----> 1 add.cache
NameError: name 'add' is not defined
add(1, 4)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[7], line 1
----> 1 add(1, 4)
NameError: name 'add' is not defined
add.cache
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[8], line 1
----> 1 add.cache
NameError: name 'add' is not defined
@Function
def add2(x, y):
result = x + y * 2
return result
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[9], line 1
----> 1 @Function
2 def add2(x, y):
3 result = x + y * 2
4 return result
NameError: name 'Function' is not defined
Function.cache
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[10], line 1
----> 1 Function.cache
NameError: name 'Function' is not defined
add2(3, 4)
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[11], line 1
----> 1 add2(3, 4)
NameError: name 'add2' is not defined
Function.cache
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
Cell In[12], line 1
----> 1 Function.cache
NameError: name 'Function' is not defined