Programming Forums > Script Programming > Python

Sane · Feb 23rd, 2006, 6:58 PM

I need something that will allow code encased in "try", to not be excepted by a specific error message.

The deprecated HTTP redirect in cherrypy raises an error called "cherrypy._cperror.HTTPRedirect", which messes up my debug decorator.

I need to be able to go:

(Toggle Plain Text)

try, noexcept cherrypy._cperror.HTTPRedirect:
    code1
except:
    code2

Where code2 will not be executed if an HTTPRedirect error occurs, but it will with any other error.

Any solutions? The obvious being not to use an external redirect.

The Dark · Feb 24th, 2006, 12:28 AM

Do you want to trap the exception and not perform code2? I would think you would do something like:

(Toggle Plain Text)

try:
    code1
except cherrypy._cperror.HTTPRedirect:
    /* Do nothing*/
except:
    code2

or do you want to completely ignore the error and continue on with the rest of code1? In this case, you might have to have try ... except around each inidivual bit of code that might cause the exception (or put it in a function that has the try ... except in it).

Arevos · Feb 24th, 2006, 5:40 AM

HTTPRedirect is an exception that isn't an error. I can see why this would mess up your debug decorator, Sane; you want your decorator to log "normal" exceptions, but to ignore HTTPRedirect exceptions, because they need to be handled by CherryPy.

The solution is to catch the HTTPRedirect exception, and then to immediately raise it again:

(Toggle Plain Text)

try:
    code 1
except cherrypy._cperror.HTTPRedirect, e:
    raise cherrypy._cperror.HTTPRedirect, e
except:
    code 2

That should work.

Sane · Feb 24th, 2006, 4:44 PM

OOhh! Raise it again! Gah! I should have thought of that... It's so obvious! Thanks!

This is what I had tried before

(Toggle Plain Text)

        try:
            return func(*args, **kwargs)
        except cherrypy._cperror.HTTPRedirect:
            pass
        except:
            return serveError(func.func_name, func.func_code, exc_info()[0], *args, **kwargs)

Which obviously didn't work.

Feb 23rd, 2006, 6:58 PM	#1
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,888 Rep Power: 5	try, except, finally ... where's noexcept? I need something that will allow code encased in "try", to not be excepted by a specific error message. The deprecated HTTP redirect in cherrypy raises an error called "cherrypy._cperror.HTTPRedirect", which messes up my debug decorator. I need to be able to go: (Toggle Plain Text) try, noexcept cherrypy._cperror.HTTPRedirect: code1 except: code2 try, noexcept cherrypy._cperror.HTTPRedirect: code1 except: code2 Where code2 will not be executed if an HTTPRedirect error occurs, but it will with any other error. Any solutions? The obvious being not to use an external redirect.

Feb 24th, 2006, 12:28 AM	#2
The Dark Expert Programmer Join Date: Jun 2005 Posts: 852 Rep Power: 4	Do you want to trap the exception and not perform code2? I would think you would do something like: (Toggle Plain Text) try: code1 except cherrypy._cperror.HTTPRedirect: /* Do nothing/ except: code2 try: code1 except cherrypy._cperror.HTTPRedirect: / Do nothing*/ except: code2 or do you want to completely ignore the error and continue on with the rest of code1? In this case, you might have to have try ... except around each inidivual bit of code that might cause the exception (or put it in a function that has the try ... except in it).

Feb 24th, 2006, 5:40 AM	#3
Arevos Programming Guru Join Date: Aug 2005 Location: England Posts: 1,499 Rep Power: 5	HTTPRedirect is an exception that isn't an error. I can see why this would mess up your debug decorator, Sane; you want your decorator to log "normal" exceptions, but to ignore HTTPRedirect exceptions, because they need to be handled by CherryPy. The solution is to catch the HTTPRedirect exception, and then to immediately raise it again: (Toggle Plain Text) try: code 1 except cherrypy._cperror.HTTPRedirect, e: raise cherrypy._cperror.HTTPRedirect, e except: code 2 try: code 1 except cherrypy._cperror.HTTPRedirect, e: raise cherrypy._cperror.HTTPRedirect, e except: code 2 That should work.

Feb 24th, 2006, 4:44 PM	#4
Sane Programming Guru Join Date: Apr 2005 Location: Waterloo, Ontario Posts: 1,888 Rep Power: 5	OOhh! Raise it again! Gah! I should have thought of that... It's so obvious! Thanks! This is what I had tried before (Toggle Plain Text) try: return func(args, kwargs) except cherrypy._cperror.HTTPRedirect: pass except: return serveError(func.func_name, func.func_code, exc_info()[0], args, *kwargs) try: return func(args, *kwargs) except cherrypy._cperror.HTTPRedirect: pass except: return serveError(func.func_name, func.func_code, exc_info()[0], args, **kwargs) Which obviously didn't work.

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Programming Forums > Script Programming > Python

try, except, finally ... where's noexcept?