Create python property function dynamically

Question

I want to create property method dynamically.

It means, for example, i want first class A to be equivalent with second one.

Is there any way?

class A(object):
  def __init__(self):
    self._a = 10
    self.createPropertyMethod(a, self._a, getFunc, setFunc, delFunc)

  def createPropertyMethod(self, name, value, getFunc, setFunc, delFunc)
     #TODO

.

class A(object):
  def __init__(self):
    self._a = 10

  @property
  def a(self):
    return getFunc(self._a)
  @a.setter
  def a(self, value):
    setFunc(self._a, value)
  @a.deleter
  def a(self):
    delFunc(self._a)

Martijn Pieters · Accepted Answer · 2014-09-01 15:14:27Z

3

You can't, not on instances. The property object needs to be part of the class for the descriptor protocol on which it relies to work.

You can use the __getattr__, __setattr__ and __delattr__ hooks instead to proxy attribute access dynamically.

answered Sep 1, 2014 at 15:14

Martijn Pieters

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4 Comments

bluefoggy Over a year ago

Does creating a decorator on class would work what @asleea wants to achieve ? Well i am not very much comfortable in the new style classes thing.

Martijn Pieters Over a year ago

@kingsdeb: a class decorator would alter the class, not the instance. So, yes, you can create property objects in the decorator, add those to the class and have them work.

bluefoggy Over a year ago

@Martin Pieters -Would you show me such a code with little more explanation please?

Martijn Pieters Over a year ago

@kingsdeb: no, because that's outside scope of this question.

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