human
Solve the following python programming problem given the following code:
def __call__(self, fn) : 
    @ functools.wraps (fn) 
    def wrapped_f(* args) : 
        generator = fn (* args) 
        for v in generator : 
            if isinstance (v, dict) : 
                if ('value' not in v) : 
                    v ['value'] = 1 
if (v.get ('group_by') is None) : 
                    v ['group_by'] = None 
else : 
                    if isinstance (v ['group_by'], tuple) : 
                        v ['group_by'] = list (v ['group_by']) 
else : 
                        if (not isinstance (v ['group_by'], list)) : 
                            v ['group_by'] = [v ['group_by']] 
else : 
                if isinstance (v, list) : 
                    v = dict (date = v [0], value = v [1], group_by = None) 
else : 
                    v = dict (date = v, value = 1, group_by = None) 
try : 
                self.validate (v) 
except EmitterValidationError as e : 
                generator.throw (e) 
(yield v) 
wrapped_f._reduce_type = wrapped_f.reduce_type 
    wrapped_f._fluff_emitter = self.fluff_emitter 
    return wrapped_f 

    
    

    Fix the buggy line: wrapped_f._reduce_type = wrapped_f.reduce_type
assistant
#Here is Python code to fix the buggy line: wrapped_f.

wrapped_f._reduce_type = self.reduce_type