On Sun, 16 May 2010 18:58:45 -0400, Paul LaFollette wrote: > First, I've looked a fair bit and can't find how one can find the base > classes of a subclass?
subclass.__base__ subclass.__bases__ subclass.__mro__ (The third one stands for "Method Resolution Order".) See also the inspect module. > So, it appears that function is perhaps the equivalent of a Java final > class? Or isn't really a class at all but something that "looks like" a > class? No, it really is a class, at least as far as Python is concerned: >>> type(lambda: None) <class 'function'> >>> type(type(lambda: None)) <class 'type'> but as you've discovered, it's also special. Unfortunately I can't find any explanation of *why* (other than the obvious that subclassing doesn't work). > Anyway, again can you point me to somewhere that I can learn more? In > particular, is there a list somewhere of the builtin types that are not > subclassable? I don't believe so. Apart from intellectual curiosity, is there any reason you need to know? This may be helpful: http://www.python.org/dev/peps/pep-0253/ You can also google for the error message, although in my few minutes of searching I've only found people demonstrating the failure and not explaining it. Here's a rather long discussion about subclassing function: http://mail.python.org/pipermail/python-list/2008-March/531661.html but again, no explanation of why type(function) isn't subclassable. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
