How can I determine the monitor refresh rate?

I am not sure about the platform you use, but on window you can use ctypes or win32api to get details about devices e.g. using win32api

import win32api

def printInfo(device):
    print((device.DeviceName, device.DeviceString))
    settings = win32api.EnumDisplaySettings(device.DeviceName, -1)
    for varName in ['Color', 'BitsPerPel', 'DisplayFrequency']:
        print("%s: %s"%(varName, getattr(settings, varName)))

device = win32api.EnumDisplayDevices()
printInfo(device)

output on my system:

\\.\DISPLAY1 Mobile Intel(R) 945GM Express Chipset Family
Color: 0
BitsPerPel: 8
DisplayFrequency: 60

On macOS, you can use pyobjc to query the refresh rate of all the attached displays. You'll need the Cocoa (i.e. "AppKit") framework for this:

$ python3 -m venv screen-res
$ . ./screen-res/bin/activate
$ pip install pyobjc-framework-Cocoa

then, in Python:

from AppKit import NSScreen

for each in NSScreen.screens():
    print(f"{each.localizedName()}: {each.maximumFramesPerSecond()}Hz")

On my system, this produces:

LG HDR WQHD+: 120Hz
Built-in Retina Display: 120Hz

(Which is correct, my displays are indeed both set to a 120Hz refresh rate.)

On Linux, you can use python-xlib:

from Xlib import display
from Xlib.ext import randr
d = display.Display()
default_screen = d.get_default_screen()
info = d.screen(default_screen)
print(randr.get_screen_info(info.root).rate)

Associating the appropriate screen index number with the place you want your PyOpenGL window to open up on is left as an exercise for the reader :).

(I won't duplicate Anurag's answer for Windows here, especially since I can't test it, but that's how you would do it on that platform.)

You can use the pygame clock

fps = 60
clock = pygame.time.Clock()

At the end of the code: clock.tick(fps)

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