This package add a callable descriptor called method descriptor which can apply on methods.
Project description
fancy-descriptors
This package adds a callable descriptor called method descriptor which can apply to methods.
Usage
a simplest example:
import fancy.descriptor as fd
class MyDescriptor(fd.MethodDescriptor):
pass
class MyClass:
@MyDescriptor
def method_a(self):
pass
# or
@MyDescriptor.bind()
def method_b(self):
pass
# after a MyClass object is created.
my_obj = MyClass()
assert isinstance(my_obj.method_a, MyDescriptor)
# returned {"method_a": <MyDescriptor object>, "method_b": <MyDescriptor object>}
MyDescriptor.get_marked_method(my_obj)
the statement MyDescriptor.get_marked_method(my_obj) will get all marked methods' descriptors
with metadata
import fancy.descriptor as fd
class MyDescriptor(fd.MethodDescriptor):
def __init__(self,method, value: int, factory = None):
"""
method must at first place of argument
factory is a method descriptor factory for underlying descriptor
"""
super().__init__(method, factory)
self._value = value
def get_value(self):
return self._value
class MyClass:
# you cannot directly use MyDescriptor as decorator
# if the constructor of the descriptor has over one required argument
# you must use .bind() to instead.
@MyDescriptor.bind(value=1)
def method_annotated(self):
pass
my_obj = MyClass()
my_obj.method_annotated.get_value() # returned 1
Inheritance
import fancy.descriptor as fd
class MyBaseDescriptor(fd.MethodDescriptor):
pass
class MyDescriptor(MyBaseDescriptor):
pass
class MyClass:
@MyBaseDescriptor
def method_base(self):
pass
@MyDescriptor
def method_sub(self):
pass
my_obj = MyClass()
MyBaseDescriptor.get_marked_method(my_obj) # returned both method_base and method_sub
MyDescriptor.get_marked_method(my_obj) # returned only method_sub
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