UnboundLocalError: Local variable 'Tee' referenced before assignment
fredrik at effbot.org
Thu Dec 7 06:58:19 CET 2000
jschmitt at vmlabs.com wrote:
> I'm getting an error message that I don't understand. I'm using this
> handy class that someone kindly on comp.lang.python:
> class Tee:
> Think of the unix command-line utility
> def __init__( self, *fileobjects ):
> self.fileobjects = fileobjects
> def write( self, string ):
> for fileobject in self.fileobjects:
> fileobject.write( string )
> and I'm using it kind of like this:
> reportfile = open( os.path.join( workingdir, "report.txt" ), "w" )
> sys.stdout = Tee( reportfile, sys.stdout ) # THIS LINE IS THE PROBLEM
> # do some print's here...
> del Tee
assuming the last code is inside a function:
> del Tee # THIS LINE IS THE PROBLEM
why do you think you have to remove the Tee class
from the local scope?
when you do this, Python thinks Tee is a local variable, which
means that you cannot use it *before* it has been assigned
inside the function.
just remove the "del" statement, and it'll work as expected.
> UnboundLocalError: Local variable 'Tee' referenced before assignment
> Does anyone have a spare clue?
did you look in the manual?
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