[Python-bugs-list] [ python-Bugs-472940 ] can't getattr() attribute shown by dir() (original) (raw)

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Sat, 20 Oct 2001 23:22:58 -0700

Bugs item #472940, was opened at 2001-10-19 15:31 You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=472940&group_id=5470

Category: Python Interpreter Core Group: None Status: Open Resolution: None Priority: 5 Submitted By: Jeremy Hylton (jhylton)

Assigned to: Guido van Rossum (gvanrossum) Summary: can't getattr() attribute shown by dir()

Initial Comment: I occasionally write introspective code that does something like:

for attr in dir(obj): print attr, getattr(obj, attr)

I ran into a problem with it, though:

ArithmeticError.init dir(ArithmeticError.init) ['call', 'class', 'cmp', 'delattr', 'dict', 'doc', 'get', 'getattribute', 'hash', 'init', 'name', 'new', 'reduce', 'repr', 'setattr', 'str', 'im_class', 'im_func', 'im_self'] 'dict' in dir(ArithmeticError.init) 1 ArithmeticError.init.dict Traceback (most recent call last): File "", line 1, in ? AttributeError: 'builtin_function_or_method' object has no attribute 'dict'

Comment By: Tim Peters (timone) Date: 2001-10-20 23:22

Message: Logged In: YES user_id=31435

Guido, yes, the string 'dict' is a key in

ArithmeticError.init.class.dict

so merge_class_dict() (object.c) merges it into the result dict for ArithmeticError.init.

Perhaps PyObject_Dir should try PyObject_HasAttr on every key it finds and weed out the ones that fail? Surely a hack, but would fix Jeremy's problem. simply by trying it before he does .

Comment By: Guido van Rossum (gvanrossum) Date: 2001-10-20 06:01

Message: Logged In: YES user_id=6380

For Tim.

Is it possible that the dict comes from looking at all the attributes of foo.class? ArithmeticError.init.class has a dict attribute.

You can respond by visiting: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=472940&group_id=5470