"PP" == Paul Prescod <paul@prescod.net> writes:
PP> * implementation language and Python inheritance semantics PP> are almost completely distinct. After all, we have Python PP> implementations in a variety of languages with minor PP> incompatibilities. Python could have a proper type/class PP> merging even if it were written in assembly language. So PP> let's leave implementation language aside. Jython experience backs this up. It would be incredibly convenient if we could just map Java classes to Python classes, so that for example, we'd have in Java a PyException class that is exceptions.Exception with minimal or no Java wrappings. And Finn nearly did this. The problem that we ran into with Java is that it allows only single inheritance. So you couldn't create a Python exception that multiply inherited from two or more other Python exceptions. Doesn't happen often, but it does happen, so is that an acceptable tradeoff? C++ might be better in this particular respect, but there will be other issues, because as soon as you start transparently showing the implementation's classes into Python, you inherit their semantics and restrictions as well. Just saying that it's tricky. -Barry