42 lines
982 B
Python
42 lines
982 B
Python
|
|
||
|
|
def intDescriptor(inst, *args):
|
||
|
|
if args:
|
||
|
|
print("Setter called on",inst,"with value",args)
|
||
|
|
else:
|
||
|
|
print("Getter called on",inst)
|
||
|
|
return inst * inst
|
||
|
|
|
||
|
|
int.foo = property(intDescriptor)
|
||
|
|
|
||
|
|
print(2.foo)
|
||
|
|
2.foo = 72
|
||
|
|
|
||
|
|
# Now let's try an example straight from the Python docs
|
||
|
|
|
||
|
|
class LoggedAgeAccess:
|
||
|
|
def __get__(self, obj, objtype=None):
|
||
|
|
let value = obj._age
|
||
|
|
print("Accessing 'age' of", obj.name)
|
||
|
|
return value
|
||
|
|
def __set__(self, obj, value):
|
||
|
|
print("Updating 'age' of", obj.name, "to", 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
|
||
|
|
|
||
|
|
let mary = Person('Mary M', 30)
|
||
|
|
let dave = Person('Dave D', 40)
|
||
|
|
print(*(x for x in dir(mary) if x not in dir(type(mary))))
|
||
|
|
print(*(x for x in dir(dave) if x not in dir(type(dave))))
|
||
|
|
|
||
|
|
print(mary.age)
|
||
|
|
mary.birthday()
|
||
|
|
print(dave.age)
|
||
|
|
|