human
Solve the following python programming problem given the following code:
def dispatch_for(self, expr) : 
    def decorate(fn) : 
        (dbname, driver) = self._parse_dispatch (expr) 
        if (fn is self) : 
            fn = fn._last 
self._last = fn 
        self._register (expr, dbname, driver, fn) 
        return self 
return self 

    
    

    Fix the buggy line: return self
assistant
#Here is Python code to fix the buggy line: return self
.

return def decorate(