Re: I can't inherit from compiled classes ?
I understand what you are saying, and at the same time don't understand why it doesn't work. Isn't everything an object in python? And if something is an object does it not implies it's an instance of some class? It means that, but it seems that you can't subclass everything, especially functions: ft = type(lambda x: x) ft type 'function' class FunctionSubclass(ft): pass ... Traceback (most recent call last): File stdin, line 1, in ? TypeError: Error when calling the metaclass bases type 'function' is not an acceptable base type But even _if_ you could - what good does it do to you? select being an _instance_ of function, it doesn't help you anything to subclass from it's class. This doesn't affect select itself, in the same sense that instances of some class Foo aren't affected by a subclass Bar(Foo). Besides that, the semantics of subclassing a function type are unclear. What would you expect? Does this mean I can't somehow make this work: class PollingSocket(socket.socket, select): ? As I point out above, this is a non-sensical thing to do anyway. Maybe you should tell us what you want to accomplish here? Diez -- http://mail.python.org/mailman/listinfo/python-list
I can't inherit from compiled classes ?
Hello list, I'm trying to subclass socket and select, for both I get: TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) , I don't understand this error. Why would python try to pass 3 arguments (what are they) ? Googling for this error gave random results talking about try to inherit a Package but socket is definitely a class, (/usr/lib/python2.4/socket.py). Not sure about select thought. I've did the following to receive the error: In [1]: import socket In [2]: class PollingSocket(socket): ...: pass ...: --- exceptions.TypeError Traceback (most recent call last) /home/hq4ever/ipython console TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) What am I breaking wrong? Thank you, Maxim. -- Cheers, Maxim Veksler Free as in Freedom - Do u GNU ? -- http://mail.python.org/mailman/listinfo/python-list
Re: I can't inherit from compiled classes ?
On Apr 29, 12:48 pm, Maxim Veksler [EMAIL PROTECTED] wrote: Hello list, I'm trying to subclass socket and select, for both I get: TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) , I don't understand this error. Why would python try to pass 3 arguments (what are they) ? Googling for this error gave random results talking about try to inherit a Package but socket is definitely a class, (/usr/lib/python2.4/socket.py). Not sure about select thought. I've did the following to receive the error: In [1]: import socket In [2]: class PollingSocket(socket): ...: pass ...: --- exceptions.TypeError Traceback (most recent call last) /home/hq4ever/ipython console TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) What am I breaking wrong? Thank you, Maxim. -- Cheers, Maxim Veksler Free as in Freedom - Do u GNU ? Try: import socket class PollingSocket(socket.socket): pass ~Sean -- http://mail.python.org/mailman/listinfo/python-list
Re: I can't inherit from compiled classes ?
In [EMAIL PROTECTED], Maxim Veksler wrote: Hello list, I'm trying to subclass socket and select, for both I get: TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) , I don't understand this error. Why would python try to pass 3 arguments (what are they) ? Googling for this error gave random results talking about try to inherit a Package but socket is definitely a class, (/usr/lib/python2.4/socket.py). Not sure about select thought. I've did the following to receive the error: In [1]: import socket In [2]: class PollingSocket(socket): ...: pass ...: --- exceptions.TypeError Traceback (most recent call last) /home/hq4ever/ipython console TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) What am I breaking wrong? You are trying to subclass a module here, just like the error message says. The module contains a `socket` type: In [3]: import socket In [4]: type(socket) Out[4]: type 'module' In [5]: type(socket.socket) Out[5]: type 'type' `select.select()` is a function: In [6]: import select In [7]: type(select.select) Out[7]: type 'builtin_function_or_method' Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: I can't inherit from compiled classes ?
On 4/29/07, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: In [EMAIL PROTECTED], Maxim Veksler wrote: Hello list, I'm trying to subclass socket and select, for both I get: TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) , I don't understand this error. Why would python try to pass 3 arguments (what are they) ? Googling for this error gave random results talking about try to inherit a Package but socket is definitely a class, (/usr/lib/python2.4/socket.py). Not sure about select thought. I've did the following to receive the error: In [1]: import socket In [2]: class PollingSocket(socket): ...: pass ...: --- exceptions.TypeError Traceback (most recent call last) /home/hq4ever/ipython console TypeError: Error when calling the metaclass bases module.__init__() takes at most 2 arguments (3 given) What am I breaking wrong? You are trying to subclass a module here, just like the error message says. The module contains a `socket` type: In [3]: import socket In [4]: type(socket) Out[4]: type 'module' In [5]: type(socket.socket) Out[5]: type 'type' Great, from socket import socket import select class PollingSocket(socket): pass `select.select()` is a function: In [6]: import select In [7]: type(select.select) Out[7]: type 'builtin_function_or_method' I understand what you are saying, and at the same time don't understand why it doesn't work. Isn't everything an object in python? And if something is an object does it not implies it's an instance of some class? Does this mean I can't somehow make this work: class PollingSocket(socket.socket, select): ? Thanks for the help, Ciao, Marc 'BlackJack' Rintsch Maxim. -- Cheers, Maxim Veksler Free as in Freedom - Do u GNU ? -- http://mail.python.org/mailman/listinfo/python-list
Re: I can't inherit from compiled classes ?
En Sun, 29 Apr 2007 17:27:59 -0300, Maxim Veksler [EMAIL PROTECTED] escribió: On 4/29/07, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: from socket import socket import select class PollingSocket(socket): pass `select.select()` is a function: I understand what you are saying, and at the same time don't understand why it doesn't work. Isn't everything an object in python? And if something is an object does it not implies it's an instance of some class? I'm not sure if your last statement is true now, and certainly it was not true before Python 2.2; there were objects that were not class instances (numbers, functions, by example). Maybe some objects still remain that are not instances of any class. Anyway, an object and a class are not the same thing, and you can't use an arbitrary object when you actually need a class. Does this mean I can't somehow make this work: class PollingSocket(socket.socket, select): ? Those things inside () are called base classes; this is class inheritance; you create a new class inheriting from existing ones. That is, you cant inherit from select, because select is a function, not a class. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
