[Python] How to get an actual expression for the derivative of the lambert W function using...

I am trying to convert sympy expression into plot-able numerical functions so that I can use matplotlib. I did not want to use numerical differentiation methods, hence the use of sympy in the first place. I am using the lambert W function in the form of sym.LambertW inside on of the expressions and when taking its derivative, I am getting Derivative(...) inside my expression. The problem with this is that sympy's numerical converter lambdify() is giving errors when I try to use it on such expressions. How to get rid of Derivative(...) so that I can use lamdify() and plot the derivative using matplotlib?

def f(x):
return sym.re(LambertW(x))

x = sym.symbols('x')
der_x = sym.diff(f(x),x)

print(der_x)


Output: - Derivative(re(LambertW(x)), x)

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