timecontrol.py

import time

key = True
intrval = 0.050

for j in range(10000):
        
    while key:
        now = ( time.time() % 1 ) 
        dif = intrval - now % intrval
        key = not ( dif  < 0.005 )
        time.sleep( dif*0.6 )
    
    now = time.time()
    print now, ( intrval - ( now % 1 % 0.050 ) )
    time.sleep(0.005)
    key = True