human
Solve the following python programming problem given the following code:
def expand_2arg(e) : 
    from sympy.simplify.simplify import bottom_up 
    def do(e) : 
        if e.is_Mul : 
            (c, r) = e.as_coeff_Mul () 
            if (c.is_Number and r.is_Add) : 
                return _unevaluated_Add (* [(c * ri) for ri in r.args]) 
return e 
return bottom_up (do, do) 

    
    

    Fix the buggy line: return bottom_up (do, do)
assistant
#Here is Python program to fix the buggy line: return bottom_up (do, do)
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return bottom_up (e, do)