In article <358b227c-d836-4243-b79a-57258590a...@a10g2000pre.googlegroups.com>, metal <metal...@gmail.com> wrote: > >I want to get pattern matching like OCaml in python(ref:http:// >en.wikipedia.org/wiki/Tagged_union) > >I consider the syntax: > >def decl(): > def Plus(expr, expr): pass > def Minus(expr, expr): pass > def Times(expr, expr): pass > def Divide(expr, expr): pass > def Value(str): pass > @enum > def expr(Plus, Minus, Times, Divide, Value): pass > declare_types(locals()) > >def f(e): > def _Plus(l, r): > return '(%s+%s)' % (l, r) > def _Minus(l, r): > return '(%s-%s)' % (l, r) > def _Times(l, r): > return '(%s*%s)' % (l, r) > def _Divide(l, r): > return '(%s/%s)' % (l, r) > def _Value(x): > return x > try: > match(e, locals()) # visitor pattern > except NoMatchedError: > pass
Perhaps you want to define what match() does? -- Aahz (a...@pythoncraft.com) <*> http://www.pythoncraft.com/ The best way to get information on Usenet is not to ask a question, but to post the wrong information. -- http://mail.python.org/mailman/listinfo/python-list
