import py

class FakeDict(dict):
    def __init__(self, **kwargs):
        self.dict = kwargs
        
    def __getitem__(self, key):
        return self.dict.get(key, '')
        
    __marker__ = []
    def get(self, key, default=__marker__):
        ret = self.dict.get(key, default)
        if ret == __marker__:
            return ''
        return ret

def errorhandler(self, request, exc, e, tb):
    from templess.templess import elnode, textnode
    h1 = elnode('h1', {}, None, None)
    textnode('%s - %s' % (exc, e), h1)
    pre = elnode('pre', {}, None, None)
    textnode('\n'.join(py.std.traceback.format_tb(tb)), pre)
    # note that we don't return a normal dict, instead we return something
    # that returns an empty string on access to keys that are not available
    
    return FakeDict(title = '%s - %s' % (exc, e), body = [h1, pre])