On 15Nov2008 22:41, Filip Gruszczyński <[EMAIL PROTECTED]> wrote:
| I really don't understand, what's happening with the following code.
| Am I doing something wrong?
Yes. This is a common mistake:
| class EnumeratedContent:
| def __init__(self, values = []):
| self.values_ = values
The "values = []" happens at class definition time, not instance
definition time. So when "values" is not supplied, the same list
is reused as the default value.
The usual idiom is this:
class EnumeratedContent:
def __init__(self, values = None):
if values is None:
values = []
self.values_ = values
which makes a new [] during the instance creation.
Cheers,
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Cameron Simpson <[EMAIL PROTECTED]> DoD#743
http://www.cskk.ezoshosting.com/cs/
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