On May 15, 4:18 pm, MisterPete <[EMAIL PROTECTED]> wrote:
> How can I inherit from file but stil create an instance that writes to
> stdout?
> -----------
> I'm writing a file-like object that has verbosity options (among
> some other things). I know I could just set self.file to a file object
> rather than inheriting from file. I started with something like this
> (simplified for clarity):
>
> class Output(object):
> def __init__(self, file=sys.stdout, verbosity=1):
> self.verbosity = verbosity
> self.file = file
>
> def write(self, string, messageVerbosity=1):
> if messageVerbosity <= self.verbosity:
> self.file.write(string)
> ...
>
> but it is frustrating me that if I try to inherit from file it
> works fine for regular files but I can't figure out a clean way to
> instantiate an object that writes to stdout using sys.stdout.
> something like the following:
>
> class Output(object):
> def __init__(self, file=sys.stdout, verbosity=1):
> self.verbosity = verbosity
> self.file = file
>
> def write(self, string, messageVerbosity=1):
> if messageVerbosity <= self.verbosity:
> self.file.write(string)
> ...
>
> I hope that's clear. Is it just a bad idea to inherit from file to
> create a class to write to stdout or am I missing something? Any
> insight is appreciated.
>
> Thanks,
> Pete
Your code works for me:
import sys
class Output(file):
def __init__(self, file=sys.stdout, verbosity=1):
self.verbosity = verbosity
self.file = file
def write(self, string, messageVerbosity=1):
if messageVerbosity <= self.verbosity:
self.file.write(string)
o = Output()
o.write("this goes to a console window")
f = open("aaa.txt", "w")
o = Output(f)
o.write("this goes to a file")
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