nisp wrote: > Hi all ! > > I'm trying to capture stderr of an external module I use in my python > program. I'm doing this > by setting up a class in my module overwriting the stderr file object > method write. > The external module outputs to stderr this way: > > from sys import std err > > .... > > print >> stderr, "Some text" > > While in my module I use > > import sys > > ..... sys.stderr ... sys.stdout > > Well, as long as I do not change in the external module those from/ > import statements to just > > import sys > > .... > > print >> sys.stderr, "Some text" > > I'm not able to capture its stderr and of course I would like not to > do this kind of change. > I've always been convinced of the equivalence of the two ways of using > the import statement > but it's clear I'm wrong :-( > > Please, someone can tell me what's going on ? > > Thanks in advance !
A practical approach to complement Diez' link to the explanation: Instead of modifying the external module you can either redirect stderr before you import the external module import sys sys.stderr = whatever import external or monkey-patch: import sys import external sys.stderr = external.sterr = whatever Peter -- http://mail.python.org/mailman/listinfo/python-list
