Bugs item #1539847, was opened at 2006-08-14 15:47
Message generated for change (Comment added) made by w_barnes
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Category: Python Interpreter Core
Group: Python 2.4
Status: Closed
Resolution: Invalid
Priority: 5
Submitted By: W Barnes (w_barnes)
Assigned to: Nobody/Anonymous (nobody)
Summary: Identifiers begining with __ renamed
Initial Comment:
Identifiers used in a class function that start with
__ are renamed to _classname__identifer even if the
identifier is owned by some other object.
Code snippet:
size = len(Data.__entry_dates)
Here I'm trying to access the identifier
__entry_dates in the module Data from the function
DataTestCase.testEntryDates() but I get the following:
Traceback (most recent call last):
File "DataTest.py", line 247, in testEntryDates
size = len(Data.__entry_dates)
AttributeError: 'module' object has no
attribute '_DataTestCase__entry_dates'
I'm using Python 2.4.3 on Windows XP sp2
Thanks,
Walter
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>Comment By: W Barnes (w_barnes)
Date: 2006-08-16 10:10
Message:
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Thanks!
I was unaware that name mangling applied to global
attributes as well as class attributes.
The error message is a bit misleading though. If I define
__widget in foo then access it from bar as foo.__widget
why does it rename it as _bar__widget if it was not
defined there? If it needs to do this internally why not
use the unmangled name for the error message?
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Comment By: Georg Brandl (gbrandl)
Date: 2006-08-14 16:07
Message:
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user_id=849994
This is exactly how __ name mangling is supposed to work.
These are meant to be private, and thus shouldn't be
accessed from another class.
If the attribute was in another class, you could do the
mangling (with the correct class name!) yourself, as it's on
a module in this case, use __dict__:
size = len(Data.__dict__['__entry_dates'])
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