R. David Murray a écrit :
I'm trying one approach in email6: Bytes and String subclasses, where the subclasses have an attribute named 'literals' derived from a utility module that does this:literals = dict( empty = '', colon = ':', newline = '\n', space = ' ', tab = '\t', fws = ' \t', headersep = ': ', ) class _string_literals: pass class _bytes_literals: pass for name, value in literals.items(): setattr(_string_literals, name, value) setattr(_bytes_literals, name, bytes(value, 'ASCII')) del literals, name, value And the subclasses do: class BytesHeader(BaseHeader): lit = email.utils._bytes_literals class StringHeader(BaseHeader): lit = email.utils._string_literals
I've just written a decorator which applies a similar strategy for insulated functions, by passing them an appropriate namespace as an argument. It could be useful in cases where only a few functions are polymorphic, not a full class or module.
http://code.activestate.com/recipes/577393-decorator-for-writing-polymorphic-functions/ Cheers, B. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
