busy_sleep.py

import time

def busy_sleep(secs):
    sts, lts = time.perf_counter(), time.perf_counter()
    mf = 0
    
    while True:
        nts = time.perf_counter()
        dt = nts - sts

        if dt + mf >= secs:
            break
    
        if nts != lts:
            mf = max(mf, nts - lts)
            lts = nts