Every day something new. Thanks a lot :) 2008/11/15 Cameron Simpson <[EMAIL PROTECTED]>: > 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, > -- > Cameron Simpson <[EMAIL PROTECTED]> DoD#743 > http://www.cskk.ezoshosting.com/cs/ > > If you don't live on the edge, you're taking up too much space. - t-shirt > -- > http://mail.python.org/mailman/listinfo/python-list >
-- Filip Gruszczyński -- http://mail.python.org/mailman/listinfo/python-list
