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) def main(): n = notafile('/dev/stdout', "w") print vars(n) import sys sys.stdout = n print "Testing: 1, 2, 3..." output: {'__str__': None, 'xreadlines': None, 'readlines': None, 'flush': None, 'close': None, 'seek': None, '__init__': None, '__setattr__': None, '__reduce_ex__': None, '__new__': None, 'readinto': None, 'next': None, 'write': None, '__doc__': None, 'isatty': None, 'truncate': None, 'read': None, '__reduce__': None, '__getattribute__': None, '__iter__': None, 'readline': None, 'fileno': None, 'writelines': None, 'tell': None, '__delattr__': None, '__repr__': None, '__hash__': None} Testing: 1, 2, 3...
I tried the code (on Windows, so had to change /dev/stdout to /temp/notafile.txt) and it worked just fine. Perhaps the issue is that n is being set to /dev/stdout instead of some other file so no difference is apparent?
In other words, you're assigning stdout to stdout. ~Ethan~ -- http://mail.python.org/mailman/listinfo/python-list
