Hey all,
Does anyone know if it's possible to call a property setter inside of a
class's init method? Below is a code sample of what I'm trying to do.
class Question(object);
def __init__(self, value):
self.text(value)
@property
def text(self):
return self._text
@text.setter
def text(self, value):
if not isinstance(value, str):
raise TypeError
self._text = value
Here's an explanation of what I'm trying to accomplish:
I have a class with an init method that is getting bloated with
error-checking guard clauses. I was hoping to "hide" some of these guard
clauses by using the @property decorator and its associated setter method.
I'd like to use the Question.text property to set the value (or raise an
error) upon instantiation of a Question object. I figured this would clean
up my init method and move the error-checking code closer to the relevant
class attribute. I've tried numerous variations on the above init method,
but all without success.
In the current version, when I try:
>>> q = Question("Hello world?")
I get the following error:
AttributeError: 'Question' object has no attribute '_text'
I was hoping text property would create self._text for me on instantiation,
but apparently no dice. I'm also getting errors when I do the below
variations:
### variation 1 ####
def __init__(self, value):
self._text = ''
self.text(value)
### variation 2 ####
def __init__(self, value):
self._text = None
self.text(value)
Can anyone point out what I'm doing wrong? I suspect I'm misunderstanding
properties and/or the finer points of object instantiation. Any help would
be greatly appreciated!
Thanks!
Serdar
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