[Python] How to find points of the x axis corresponding to the values of y equal to some value

I have a sine signal defined by two lists

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and I want to know the points of conductance (s) at which the voltage is 0.5.

I did it wit this code: voltage = [...] conductance = [...] edges = [] for n in voltage: if n == 0: pass elif voltage[n] > 0.5 and voltage[n-1] < 0.5 : edges.append(conductance[n]) elif voltage[n] < 0.5 and voltage[n-1] > -35. : edges.append(conductance[n])'

Is there a better or more precise way of doing it? Maybe using some numpy function? Or by intersecating with a horizontal line?

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