Bastian Weber wrote:
>> Hello,
>> 
>> I think I found a bug. Calling .count_ops() on an expression
>> containing a derivative raises a NameError. 
>> 
In [ https://github.com/sympy/sympy/pull/23 ], which is awaiting final review, 
this yields:

    h[1] >>> f(x).diff(x).count_ops()
    2
    h[2] >>> f(x).diff(x).count_ops(1)
    Derivative + f

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