Access keyframe values of a parameter from python expression on the same parameter without recursion

[sefisec]

Is there any way to access keyframe values of a parameter from custom python expression on the same parameter WITHOUT RECURSION as a  result?
Like, I understand why it's happening, because it's evaluating the expression each time, but is there any way to avoid that?

Basically trying to write custom interpolating function, found this video (https://www.youtube.com/watch?v=4uO21IyjIz8), which is similar to what I'm trying to do, but it's a paid one, and I only need like that single piece of information out of it 

Simple example of python expression on RX channel:

import time
node = hou.pwd()
keyframes = node.parm("rx").keyframes()
time.sleep(0.01)
print(keyframes[0].value())

time.sleep(0.01) is to demonstrate that it runs like 300 times per cook because of recursion, so it would take a few seconds to complete

Edited April 18 by sefisec

[sefisec]

So, problem solved, I made a mistake in full code, where I used keyframesInRange() wrong, and it throw recursion error, which confused me.