bukzor wrote:
I was trying to change the behaviour of print (tee all output to a
temp file) by inheriting from file and overwriting sys.stdout, but it
looks like print uses C-level stuff to do its writes which bypasses
the python object/inhertiance system. It looks like I need to use
composition instead of inheritance, but thought this was strange
enough to note.
$python -V
Python 2.5
"""A short demo script"""
class notafile(file):
def __init__(self, *args, **kwargs):
readonly = ['closed', '__class__', 'encoding', 'mode', 'name',
'newlines', 'softspace']
file.__init__(self, *args, **kwargs)
for attr in dir(file):
if attr in readonly: continue
setattr(self, attr, None)
Drop the __init__ and give notafile a .write method.
Composition version inheritance is not the the real issue.
>>> class nf(object):
def write(s):
print(s)
print(s)
>>> print >>nf(), 'testing'
testing
testing
Now change nf.write to put the copy where you want it.
tjr
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