GHPython, Select Surface based on Boolean Operation

Hello All,

I am relatively new to GHPython and Python Coding, in general. I wanted to create a Boolean Trigger/Toggle operation that if triggered to 'True' it would prompt the user to select a single surface from the Rhino document and output to use it through the rest of the Grasshopper file. I am not sure if I am approaching this correctly, however I have attached the code I have tried to run based on my investigations about python:

import rhinoscriptsyntax as rs
import scriptcontext as sc
import Rhino as rc

if x:
srf_obj = rs.GetObject("Select the Surface", False, True)
a = srf_obj
print a
else:
a = "False"
print a

I would appreciate any guidance, thank you.