[Python] is it possible to Python code to measure FPS in specific Games/Window [closed]

I need to monitor FPS of a specific game / window and I have tried this, it is constantly showing FPS around 60 FPS but it is not actually true...

import time
import collections

class FPS:
def __init__(self,avarageof=50):
self.frametimestamps = collections.deque(maxlen=avarageof)
def __call__(self):
self.frametimestamps.append(time.time())
if(len(self.frametimestamps) > 1):
return len(self.frametimestamps)/(self.frametimestamps[-1]-self.frametimestamps[0])
else:
return 0.0
fps = FPS()

while True:
time.sleep(0.1)
print(round(fps()))

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