To add to your example. Default arguments are parsed once by the
interpreter, not each time the program is run. Most folks don't desire side
effects like this. One way to avoid it is to only use immutable
types<http://docs.python.org/reference/datamodel.html>in python as
keyword arguments (True, False, None, numbers, strings,
tuples).
Brian
On Tue, Oct 4, 2011 at 7:23 PM, Martin J. Laubach <goo...@emsi.priv.at>wrote:
> Are you sure your context is thread-safe, ie. it's rebuilt from scratch
> every time you render an email and not re-used, stored in a global variable,
> class variable, whatever? Your problem description very much sounds like
> someone is fiddling with the context while the template is rendering.
>
> A popular way to generate such a problem would be to use a literal dict
> as default parameter, something like:
>
> def my_render_email(recipient, context={}):
> context['email'] = recipient
> body = render_to_string('template.**html', context)
> ...
>
> That is absolutely positively guaranteed to blow up in your face when you
> least expect it.
>
> mjl
>
>
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Brian Bouterse
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