NameError, global not defined when using try,except

问题

Edit:
Ignore this, I figured it out about 3 seconds after posting this but can't delete it =(

I have this try, except code for working with RackSpace cloudfiles

    try:
        cacheobject = cachecontainer.get_object('file.jpg')
    except NoSuchObject as objectname:
        raise tornado.web.HTTPError(404)

If 'file.jpg' is not found, the exception 'NoSuchObject' is raised. When I run this code I get the error

except NoSuchObject as objectname:
NameError: global name 'NoSuchObject' is not defined

I tried putting NoSuchObject in quotes but then I got an error about string exceptions being depreciated.

回答1:

facepalm

Yeah this programming thing's only my job, nothing big

I have to use the stupid thingy thing don't I

try:
    cacheobject = cachecontainer.get_object('file.jpg')
except cloudfiles.errors.NoSuchObject as objectname:
    raise tornado.web.HTTPError(404)

I'll try and not be stupid in future

回答2:

NoSuchObject is in another module, probably in cachecontainer. You have to import it.

回答3:

did you try with an explicit import ? like this :

from cloudfiles.errors import NoSuchObject

来源：https://stackoverflow.com/questions/6060865/nameerror-global-not-defined-when-using-try-except