How to validate the __init__ parameters

Aahz aahz at pythoncraft.com
Mon Jan 11 05:54:38 CET 2010


In article <mailman.2244.1261418090.2873.python-list at python.org>,
Jean-Michel Pichavant  <jeanmichel at sequans.com> wrote:
>
>class A:
>    def __init__(self, foo = None, bar = None):
>        if len(foo) > 5:
>		raise ValueError('foo cannot exceed 5 characters')

Bad Idea -- what happens when foo is None?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"If you think it's expensive to hire a professional to do the job, wait
until you hire an amateur."  --Red Adair



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