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Python "property object has no attribute" Exception

Answer 1

+1 A:

The result of property() is an object where you can't add new fields or methods. It's immutable which is why you get the error.

Example how to use property().

[EDIT] As for the answer, you refer to: I think the indentation of the example was completely wrong when you looked at it. This has been fixed, now.

Aaron Digulla 2009-02-06 13:01:53

So the response in the link is nonsense? :-S

AJ Ostergaard 2009-02-06 13:28:08

I think the indentation is broken.

Aaron Digulla 2009-02-06 13:38:28

I don't see how indentation would fix it - let's see what motd says to your comment ...

AJ Ostergaard 2009-02-06 13:41:49

I also don't see how identation could fix it. Guess it's just wrong.

Rodrigo 2009-02-06 13:56:19

Perhaps poroperty() has chaneged in v2.6?

AJ Ostergaard 2009-02-06 14:50:02

@Aaron: What do you mean the indentation has been fixed? How does the indentation change anything? Please explain ... :-S

AJ Ostergaard 2009-02-06 16:21:20

Sorry but am I being exceptionally dense here?!? :-S

AJ Ostergaard 2009-02-07 12:35:03

AJ: In Python, indentation is everything. When I posted my comment, all code was flush left and property() outside of a class doesn't make sense at all.

Aaron Digulla 2009-02-09 08:57:19

Since the indentation has been fixed, the code should compile but it might still not work. I haven't tried it in a Python shell, yet. Sorry.

Aaron Digulla 2009-02-09 09:00:29

@Aaron: You're absolutely right about indentation being everything and that property() outside a class being non-sensical - what I can't understand is how indentation can fix attempting to create an attribute on an immutable object. Has "property()" changed in Python 2.6?

AJ Ostergaard 2009-02-09 17:25:30

>>> class C(object):... def fet_x():... return 'x'... x = property(fet_x)... x.anattr = 'alpha'... Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 5, in CTypeError: 'property' object has only read-only attributes (assign to .anattr)>>>

AJ Ostergaard 2009-02-09 17:29:27

@AJ: Nope. My comment has confused you. There are two issues: 1. The example was not correctly indented. 2. After the indentation was fixed, the example in the SO answer is still broken because the result of property() is immutable. Sorry for the confusion.

Aaron Digulla 2009-02-10 08:28:45

@Aaron: I see motd has acknowledged that his answer was useless. Thanks for chasing - I was very confused for a while. :)

AJ Ostergaard 2009-02-11 22:08:18

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Python "property object has no attribute" Exception

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