How can i replace function's derivation to values?

Question

Function which is include deriative like :

df = -2*x*y(x)*Derivative(y(x), x) - y(x)**2

I have got Derivative(y(x), x)'s value but i don't know how to subs

x= sp.symbols('x  ')
y=sp.Function("y")(x)
f = sp.Function("f")(x,y)

f = -x*y**2

f_num = f.subs([(y,1),(x,2)])

df = sp.diff(f,x)

# I have to calculate df_num value by using(subs) respect 
x,y,Derivative(y(x), x)

thanks everyone who is helping

Answer 1

Does this do what you mean?

import sympy as sp

x= sp.symbols('x')
y=sp.Function("y")(x)
f = sp.Function("f")(x,y)

f = -x*y**2

f_num = f.subs([(y,1),(x,2)])

df = sp.diff(f,x)
df = df.subs(sp.diff(y,x),1)

sp.pprint(df)