On May 27, 10:52 am, Peter Otten <__pete...@web.de> wrote: > This is a longstanding quirk of the CPython implementation. The > PRINT_ITEM_TO opcode triggers a PyFile_WriteObject() call which in turn does > the C equivalent of > > if isinstance(f, file): > file.write(f, s) > else: > write = getattr(f, "write") > write(s) > > Therefore subclasses of file will always use file.write() when invoked via > 'print'. > > You can avoid that by writing a wrapper instead of a subclass: > > class File(object): > def __init__(self, *args): > self._file = open(*args) > def write(self, s): > self._file.write(s) > # add other methods as needed > > Peter
Thanks very much! That solves the mystery ... -- http://mail.python.org/mailman/listinfo/python-list
