"d. savitsky" <dsavitsk at e-coli.net> wrote in message
news:VYen5.7691$ZI2.315853 at news1.rdc1.il.home.com...
> greetings, very quick question.
>
> on win32, to get printed output to a file i use
> >>> sys.stndout = open('file.txt', 'w')
> how do i get it to go back to the command line,
Two options:
a) saveso = sys.stdout
sys.stdout = open('file.txt', 'w')
# blah blah
sys.stdout = saveso
b) sys.stdout = open('file.txt', 'w')
# blah blah
sys.stdout = sys.__stdout__
Option (b), while slightly simpler, has problems
if _somebody else_ had also redirected output.
> or better yet, how do i
> output to both at the same time?
class tee_redir:
def __init__(self,*files):
self.files=files
self.stdout=sys.stdout
sys.stdout=self
def write(self,line):
for file in self.files:
file.write(line)
self.stdout.write(line)
def close(self):
for file in self.files:
file.close()
sys.stdout = self.stdout
thetee=tee_redir(open('file.txt','w'))
# whatever
thetee.close()
It's a delicate issue whether this class should
take in __init__ the already-open files, or the
filenames (and open them itself) -- I choose
the former as more general (one could also
accept both string-like OR file-like objects, but
that gets a bit complex).
Another design issue is whether this class
should self-install its latest instance as the
sys.stdout; doing so, as I show above, is a
bit inelegant and less than general -- one
could have a more general class tee that
just does the 1-to-N broadcast, and manually
install it as sys.stdout.
But anyway, I think the general idea is clear:
write a file-like object implementing the
write method however you like best, e.g by
delegating it to other file-like objects.
Alex