Chris Torek wrote: > >>> import socket > >>> isinstance(socket.error, IOError) > False
Here you test if the socket.error *class* is an instance of IOError; this would print True if IOError were socket.error's metaclass. However: >>> isinstance(socket.error(), IOError) True or more directly: >>> issubclass(socket.error, IOError) True >>> issubclass(socket.error, EnvironmentError) True This is a relatively recent change: $ python2.5 -c'from socket import error; print issubclass(error, IOError), issubclass(error, EnvironmentError)' False False $ python2.6 -c'from socket import error; print issubclass(error, IOError), issubclass(error, EnvironmentError)' True True -- http://mail.python.org/mailman/listinfo/python-list
