python_src_decorators_attribute

Example Python program python_src_decorators_attribute.py

Classes

class Attribute(object):
class Sample:

Methods

def init (self, getter, setter = None, deleter = None):
def set (self, instance, value):
def get (self, instance, cls):
def setter (self, fn):
def getter (self, fn):
def deleter (self, fn):
def init (self):
def name (self):
def test (self, value):

Code

Python example

class Attribute(object):
    __slots__ = ['fset', 'fget', 'fdel', 'name', 'value']

    def __init__ (self, getter, setter = None, deleter = None):
        self.fget = getter
        self.fset = setter
        self.fdel = deleter
        self.name = getter.__name__
        self.value = None

    def __set__ (self, instance, value):
        if self.fset is None:
            self.value = value
        else:
            self.fset(instance, value)

    def __get__ (self, instance, cls):
        result = self.fget(instance)
        if result is None and self.fset is not None:
            raise NotImplementedError('Attribute \'%s\' has setter(), but not impletement getter method' % (self.name))
        elif result is not None and self.fset is None:
            raise NotImplementedError('Attribute \'%s\' has getter(), but not impletement setter method' % (self.name))
        return result or self.value

    def setter (self, fn):
        self.fset = fn
        return self

    def getter (self, fn):
        self.fget = fn
        return self

    def deleter (self, fn):
        self.fdel = fn
        return self


if __name__ == '__main__':
    class Sample:
        def __init__ (self):
            self._name = 'This is the get text from Test'
            pass

        @Attribute
        def name (self):
            pass
            # return self._name

        # @name.setter
        # def test (self, value):
        #     self._name = value


    x = Sample()
    print x.name

    x.name = 'tsdt'
    print x.name

Useful Links

Articles: https://python-commandments.org/
Python shell: https://bsdnerds.org/learn-python/
Tutorial: https://pythonprogramminglanguage.com/