RE: [Cheetahtemplate-discuss] Overriding the NotFound exception

[Brian B. <bri...@se...>]

Thanks - this is the solution I ended up using (I basically added an
instance of SafeDict to the end of the searchList so I didn't need an
errorCatcher):
ie.
t=3DTemplate.Template(source=3D"Start $key $missingkey
End",searchList=3Dnamespaces+[SafeDict()])

This works fine, but I just get the feeling there should be a built-in =
way
to do this (maybe Template.py should have an optional default argument,
which if not specified will raise the NotFound exception as normal?)

Brian

-----Original Message-----
From: Doug Wyatt [mailto:do...@so...]=20
Sent: 27 August 2004 18:02
To: Brian Bird
Cc: che...@li...
Subject: Re: [Cheetahtemplate-discuss] Overriding the NotFound exception


What happens if you put an instance of something like this in your=20
search list:

class SafeDict(dict):
	def __getitem__(self, k):
		if not self.has_key(k):
			return ""
		return dict.__getitem__(self, k)

?

Actually it probably needs to override more dict methods like hasitem=20
but it seems worth an experiment...

Doug

On Aug 27, 2004, at 8:40, Brian Bird wrote:
> I'd like to change the behaviour of my Template objects so that if a
> $placeholder variable doesn't exist then a blank string is printed=20
> instead of a NotFound exception being raised.
>
> Is there an easy way to do this without hacking the Template.py source
> code?
>
>
>
> I thought I might get it to work using an error handler (although
> should I really only use this for debugging?), but when I pass one to=20
> the template constructor I get an error. Here's the code:
>
> =A0from Cheetah import ErrorCatchers, Template
>  =A0namespaces=3D[{"key":"value"}]
> =A0t=3DTemplate.Template(source=3D"Start $key $missingkey End",
> searchList=3Dnamespaces,errorCatcher=3DErrorCatchers.Echo)
> =A0print t
>
> I get the error "AttributeError: class ErrorCatcher has no attribute
> '__class__' "
>
> I have to specify it as a class rather than a string because I want to
> use my own errorcatcher class if I could get it working.
>
>
>
> Thanks for any help
>
> Brian